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Large number of 404 errors on URL for articles

From: Switzerland View: 2280 Denis Florin 

Question

I checked the server logs and I found a large number of 404 errors. For example, this post https://historycollection.com/10-little-known-facts-abou-axis-prisoners-of-war-in-world-war-ii/ has some 404 URLs because something appended in the URL text like this one /-&e=MOAT.(something)

Example of URLs: https://historycollection.com/10-little-known-facts-abou-axis-prisoners-of-war-in-world-war-ii/-&e=MOAT.load

https://historycollection.com/16-horrifying-historical-locations-where-people-continue-to-live-in-the-united-states/4/-&e=MOAT.measurable

https://historycollection.com/10-little-known-facts-abou-axis-prisoners-of-war-in-world-war-ii/-&e=MOAT.inView2sec

https://historycollection.com/10-little-known-facts-abou-axis-prisoners-of-war-in-world-war-ii/-&e=MOAT.smallplayer

https://historycollection.com/10-little-known-facts-abou-axis-prisoners-of-war-in-world-war-ii/-&e=MOAT.viewable&tv=1

Most of them having referrers like this one https://historycollection.com/16-horrifying-historical-locations-where-people-continue-to-live-in-the-united-states/?utm_source=Facebook&utm_medium=Ads&utm_campaign=16-horrifying-historical-locations-where-people-continue-to-live-in-the-united-states-Automatic

And user agents like these ones:

Mozilla/5.0 (Linux; Android 10; SM-N975U1 Build/QP1A.190711.020; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/85.0.4183.101 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/289.0.0.40.121;]

Mozilla/5.0 (Linux; Android 9; E6910 Build/4.601VZ.0191.a; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/72.0.3626.121 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/163.0.0.43.91;]

Does anybody have any idea about this?

Thanks,

Best answer

These are probably bots probing for vulnerabilities.

Run the IP through something like AbuseIPDB and see what others have to say about it.