在服务器上看到一些奇怪的日志

给别人做的一个网站，放在阿里云上面。平时很少上去看，今天突然想上去瞧瞧，然后看到服务器日志里面有一些奇怪的访问日志，如下：
5.178.86.77:14389 - - [24/Oct/2015 15:48:59] "HTTP/1.1 POST azenv.php" - 404 Not Found
182.254.154.72:42477 - - [24/Oct/2015 18:19:03] "HTTP/1.1 GET test/check_proxy.php" - 404 Not Found
5.178.86.76:34713 - - [24/Oct/2015 18:59:03] "HTTP/1.1 POST azenv.php" - 404 Not Found
182.254.154.72:36303 - - [24/Oct/2015 19:16:19] "HTTP/1.1 GET test/check_proxy.php" - 404 Not Found
120.24.54.198:56163 - - [24/Oct/2015 19:19:01] "HTTP/1.1 GET /" - 303 See Other
120.24.54.198:59810 - - [24/Oct/2015 19:19:06] "HTTP/1.1 HEAD /" - 303 See Other
120.24.54.198:36319 - - [24/Oct/2015 19:19:12] "HTTP/1.1 TRACE /" - 405 Method Not Allowed
182.254.154.72:35039 - - [24/Oct/2015 19:47:04] "HTTP/1.1 GET test/check_proxy.php" - 404 Not Found
182.254.154.72:53031 - - [24/Oct/2015 20:52:05] "HTTP/1.1 GET test/check_proxy.php" - 404 Not Found
42.120.145.227:11353 - - [24/Oct/2015 21:03:09] "HTTP/1.1 GET /" - 303 See Other
42.120.145.145:20416 - - [24/Oct/2015 21:03:09] "HTTP/1.1 GET /signin" - 200 OK
182.254.154.72:52793 - - [24/Oct/2015 21:23:50] "HTTP/1.1 GET test/check_proxy.php" - 404 Not Found
182.254.154.72:38664 - - [24/Oct/2015 22:50:21] "HTTP/1.1 GET test/check_proxy.php" - 404 Not Found
182.254.154.72:40754 - - [25/Oct/2015 00:21:15] "HTTP/1.1 GET test/check_proxy.php" - 404 Not Found
182.254.154.72:59285 - - [25/Oct/2015 01:22:16] "HTTP/1.1 GET test/check_proxy.php" - 404 Not Found
5.178.86.77:4139 - - [25/Oct/2015 02:07:57] "HTTP/1.1 POST azenv.php" - 404 Not Found
185.49.14.190:36507 - - [25/Oct/2015 02:24:46] "HTTP/1.1 GET testproxy.php" - 404 Not Found
182.254.154.72:56069 - - [25/Oct/2015 03:50:17] "HTTP/1.1 GET test/check_proxy.php" - 404 Not Found
95.131.151.238:56504 - - [25/Oct/2015 03:58:49] "HTTP/1.1 GET proxy.php" - 404 Not Found
182.254.154.72:40328 - - [25/Oct/2015 04:47:47] "HTTP/1.1 GET test/check_proxy.php" - 404 Not Found
222.186.129.85:4423 - - [25/Oct/2015 05:46:00] "HTTP/1.1 GET /manager/html" - 404 Not Found
182.254.154.72:55288 - - [25/Oct/2015 06:41:57] "HTTP/1.1 GET test/check_proxy.php" - 404 Not Found
60.173.14.142:40564 - - [25/Oct/2015 06:54:20] "HTTP/1.1 POST /index.php" - 404 Not Found
182.254.154.72:47508 - - [25/Oct/2015 07:43:02] "HTTP/1.1 GET test/check_proxy.php" - 404 Not Found
182.254.154.72:48420 - - [25/Oct/2015 08:15:48] "HTTP/1.1 GET test/check_proxy.php" - 404 Not Found
42.120.142.221:33519 - - [25/Oct/2015 10:20:00] "HTTP/1.1 GET /" - 303 See Other
42.120.142.221:42657 - - [25/Oct/2015 10:20:00] "HTTP/1.1 OPTIONS /" - 405 Method Not Allowed
42.120.142.221:42683 - - [25/Oct/2015 10:20:00] "HTTP/1.1 OPTIONS /" - 405 Method Not Allowed
42.120.142.221:42684 - - [25/Oct/2015 10:20:01] "HTTP/1.1 GET /nice ports,/Trinity.txt.bak" - 404 Not Found

这些日志好像都是尝试去访问 PHP 的后台， IP 来自腾讯云与阿里云。这是别人的爬虫自动访问的，还是有人盯上这台服务器了？有这方面经验的同学能否帮忙答疑解惑一下？