Malicious PDF — malware analysis report

Static analysis result for SHA-256 f308677eb33709df…

MALICIOUS

PDF

55.6 KB Created: 2021-09-15 13:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a32bacab27e0dc8f223e0e619e809275 SHA-1: 888386b583748ac00dfce9e8247d1863e074cbad SHA-256: f308677eb33709dfb3983405cebba28b474249501dfaa3ab987117eb2a55b981
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable due to encoding issues, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9258

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.perchegouet.com/ckfinder/userfiles/files/10185456734.pdf
    • http://bbfederico2.net/userfiles/file/guzowipomudeg.pdf
    • http://anhbanglaw.com/userfiles/file/vupalasiwiluk.pdf
    • https://adminico.nl/userfiles/file/jufonoweguz.pdf
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/fukowizukos.pdf
    • http://ty-universe.com/image/files/20210915_150120.pdf
    • http://fygl.net/uploads/file/042018483229.pdf
    • http://bertoniamministrazione.it/bertoni/public/file/15447431075.pdf
    • http://solarwindependence.com/ckfinder/userfiles/files/73946731613.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/m3qumnf9cpre94p1tdgvqi56bh/jebetum.pdf
    • http://moscowballet.ru/userfiles/file/xesogenugitetagijoj.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613349716aff2---logunijaloba.pdf
    • http://jjkxmy.com/upload/files/202109030251568229.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138537ecab55---85993058072.pdf
    • https://alatheir.com/atheirwsfiles/file/daziminag.pdf
    • http://abwjefferson.com/uploads/files/nudawejolozuloko.pdf
    • https://9ja-bet.com/userfiles/file/jasinarinijovinopo.pdf
    • https://molecult.metallo-tests.ch/sites/web/upload/files/rekokexetuzefovazofunem.pdf
    • https://slotpt2.com/contents/files/76178459848.pdf
    • http://paramountswimwear.com/userfiles/files/newiwofagi.pdf
    • http://posicert.com/upload_fck/file/2021-9-3/20210903064742355329.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=mp4+to+mp3+downloader+online

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