Hi danny96,
The malware and website infection landscape is an everchanging one, exploits and silent drive-by-downloads are uploaded and taken down in an ever so quickly changing tempo, your site had a rather good web reputation rating:
http://www.mywot.com/en/scorecard/adf.ly but one sees that users already starting reporting spyware, adware, phishing and malware from there, and the bad news has not reached here:
http://www.webutation.net/go/review/adf.ly and the name of the game is SWF and that is where the malware exploit tragedy starts there. Good avast protects!
The url you reported served up: Trojan/Win32.Trojan Horse or a Bifrose variant...
polonus