[deep23]

so dident saw this topic before so hackers use rfi remote file inlclude to put a .php or a .txt now it works with .jpg and .gif too
the hackers find a bug in your page and then the put that php file or some other file into your host the mos use c99.php its a shell that allows me to to anything what i want in your site i can connect to the site with netcat and do more damge to your site
when i hacked i puted into the site a phpmailer and spamed until the web closed an other method is xss cross site scripting withthat way the "hacker" steales your admin cookie and gets access through your site
and other way that i dont know how to explain is rooting
if you wanna protect your site use htaccess or meta taks like someone above sad