Hidden iFrames not detected on website?

Not for minors, explicit content!
See: https://www.virustotal.com/nl/url/1c70f2d190fbd6095731abbb54d56d33f8679e555b79bc985f2b134988305df1/analysis/#additional-info
76 suspicious files: Severity: Suspicious
Reason: Detected hidden reference to external web resource.
Details: Detected hidden iframe tag to ‘adf.ly’
Offset: 14806

[[<iframe frameborder="0" height="0" scrolling="no" src="-http://adf.ly/5668242/exo" width="0">]]

Detected: https://urlquery.net/report.php?id=1441288295210
Suspected XSS Attack

Blocked URL: -https://www.google.pl/search?q=[[<iframe+frameborder%3D"0"+height%3D"0"+scrolling%3D"no"+src%3D"http%3A%2F%2Fadf.ly%2F5668242%2Fexo"+width%3D"0">]]&rlz=1C1AVNE_enNL649NL649&oq=[[<iframe+frameborder%3D"0"+height%3D"0"+scrolling%3D"no"+src%3D"http%3A%2F%2Fadf.ly%2F5668242%2Fexo"+width%3D"0">]]&aqs=chrome..69i57&sourceid=chrome&es_sm=122&ie=UTF-8
Avast detects and blocks! Hidden Iframes. Details: http://sucuri.net/malware/entry/MW:IFRAME:HD202?v02

See what is blocked and additional adware: -http://www.domxssscanner.com/scan?url=http%3A%2F%2Fwww.makamundo.com%2F
as -ads.juicyads.com etc. → https://www.mywot.com/en/scorecard/juicyads.com?utm_source=addon&utm_content=popup
uMatrix has prevented the following page from loading:
-http://ads.juicyads.com/

polonus