On Twitter, Google’s John Mueller made clear that disavow links files are processed automatically, without human intervention:
@Marie_Haynes @digitaleyemedia @billhunt Yep, the disavow files are generally processed automatically, no humans involved.
— John Mueller (@JohnMu) 7. Oktober 2014
Disavow files are used to inform Google about unwanted links. If you want to find bad backlinks that point to your website, use the link disinfection tool in SEOprofiler.