Malicious PDF — malware analysis report

Static analysis result for SHA-256 155cd912f11ff773…

MALICIOUS

PDF

47.6 KB Created: 2021-09-27 16:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca8d37a69b1929cec39af34d6b2358d5 SHA-1: 4f405e6973a170145275ffe2ceda1fe0a5c0a17e SHA-256: 155cd912f11ff7731db2f0d898dadd5dc838ae97db5d72f7cd0a6aa873855317
154 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7740

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f76beb59d4---15853459182.pdf
    • https://dsverano.com/UserFiles/File/xevinodegulip.pdf
    • http://akvari-um.ru/userfiles/file/24812155363.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d42a0b00e4---jeribulafo.pdf
    • https://doina.md/fckeditorfiles/file/665269003.pdf
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/21837736299.pdf
    • http://bestbuyfromindia.com/userfiles/file/wosavuxuv.pdf
    • https://store-connector.com/_upload_bilder/_filemanager/file/34817025695.pdf
    • http://apmnir.ro/fckfiles/file/74316029779.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f17df78b91---67587052405.pdf
    • https://thailonghoang.vn/upload/files/gavejiw.pdf
    • https://rh4-h1tapi-turbo.com/contents/files/gerute.pdf
    • https://showerdrainplus.com/uploads/files/202109270534236472.pdf
    • https://divinenine.net/userfiles/file/sonopanifiwu.pdf
    • http://upoart.com/ckfinder/userfiles/files/zobazuwan.pdf
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/2004504445.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5003da6ae---lujojarawakixakabonuwak.pdf
    • https://media-get.ru/userfiles/files/46474187723.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140926abacbf---57772351713.pdf
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/fuxizevumokuwimivaponet.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c72dbbb43d---15027812344.pdf
    • https://tennis94.fr/img/pics/files/56966054764.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=impossible+quiz+56

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