The site shows a PHP script targeting vbulletin. Obviously there are lots of ways of attacking servers, especially if they run PHP applications and such. There

The site shows a PHP script targeting vbulletin. Obviously there are lots of ways of attacking servers, especially if they run PHP applications and such. There was once a PDF exploit for iOS that made it possible to jailbreak the phone (or run any code) if the user opened a PDF, so the PHP program could have been redirecting to something like this. Linux malware would probably have a much lower effectiveness / $, so it doesn't pay off for them.