Content management software, Joomla, etc. are vulnerable to exploit if the version being used is old as it may have security vulnerabilities, which have been closed in the latest software versions.
The site does appear to have been hacked there is an obfuscated script tag inserted just before the closing body tag. This is on a single very long line, see image, I have broken that long line to make it easier to see (the arrow indicates it goes on for some way still).
Please 'modify' your post change the URL from http to hXXp or www to wXw, to break the link and avoid accidental exposure to suspect sites, thanks.
So unless you own the site the only thing you can do is inform the owner/webmaster, etc.