Your site has been hacked and is only showing the hacked pages when the request looks like its from google.
If you wget on of your blog articles you can see an example. (Registering your site with webmaster tools google would of notified you if it sees suspicious activity like this)
There will most likely be a base a base 64 encoded string at the top of your index.php file than when you decode will contain the exploit.
If you wget on of your blog articles you can see an example. (Registering your site with webmaster tools google would of notified you if it sees suspicious activity like this)
There will most likely be a base a base 64 encoded string at the top of your index.php file than when you decode will contain the exploit.
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