Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a457dcbcbfb4ac3…

MALICIOUS

PDF

57.1 KB Created: 2021-06-17 21:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 853fb1c03ae01f33c13b8ec4e8290334 SHA-1: 808f7903d8bf2a14330e05e893472a3a73198b4f SHA-256: 1a457dcbcbfb4ac30d84892343c1411c757f5e20884519b812e27456c5e4492d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6810

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 http://cdkkck.com/uploadfile/file/20210615031917.pdf
    • http://archi1919.com/smlclub-files/file/vatelakogunu.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609af81d6439d---35719172619.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b49925359a7---perepilazopagewalonemu.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be44fe61bca---84605765592.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ace2a3d8a7---sananiveturerawoxiku.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f07d787c59---86311927418.pdf
    • http://chiangmai-clean.com/user_img/files/fefikibifigezanisezu.pdf
    • http://yljx.cn/images/upload/File/dujijizidoja.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/5015be75d7c6eef49705055e70f78b6c/92670670874.pdf
    • https://artlabjo.com/userfiles/file/pasikabo.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/cb782e582bf65f11cef96c6251e3c2dd/53643206409.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b55dad8d4---15171541401.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=irregular+strength+bench+program+pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1d74c8572---39569992921.pdf

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