Your website has been hacked by infamous hacker in the Philippines.
A hacker that is a script kiddie that don't have any background in programming language.
Your website is still fully operational, your index has just been replaced.
Your files are still secured, I just edited or uploaded my own deface page to your website.
I'm giving you a clue, delete my backdoor so I cannot hack your website again.
Le Blanc Haxor