Yeah, a lot of these sites have like 0 TF which is bad sign from the get go. Also, Moz Trust and stats like that mean jack shit. How many referring domains do these sites have is also important, also check the anchor profile if it's spammed or not. Check if the links going to that site are just spammed links or do they seem to come from natural places for a domain like that (for that, check the archive.org for what was on that site in the past).