Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f23d7a8dbf61664…

MALICIOUS

PDF

106.1 KB Created: 2021-09-12 17:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd0bb42f13cba2395fd45e15d4bd7c5d SHA-1: af7350ae413674c926ba82e0fa1b324131c3e420 SHA-256: 0f23d7a8dbf61664f86202d4bf9a8fefd9ff95fec41fe29bbc85912fda03e648
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous external URLs pointing to PDF files. Several heuristics indicate that these links are hosted on compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which could be used to facilitate the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3832

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 https://queure.ru/uplcv?utm_term=heir+of+fire+free+online+read
    • http://britishcytology.org.uk/ckfinder/userfiles/files/nejironofukudova.pdf
    • http://eatatrudy.com/uploads/files/lekobarugim.pdf
    • https://stpatswatertown.org/ckfinder/userfiles/files/60590599247.pdf
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/kizelagodupazulukibov.pdf
    • http://barrospizzadb.com/uploads/files/36667924523.pdf
    • http://ubest.ru/images/file/79720203442.pdf
    • http://erpos.sk/data/files/gadadesetemuritumaz.pdf
    • http://say-international.eu/userfiles/file/xikuf.pdf
    • https://unitytradefze.com/ckfinder/userfiles/files/83281473607.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/93757e933bf0ff77b689b3d8ea249d09/bajevelisin.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613df6b8c4ff1---25955128782.pdf
    • http://pepinieres-soupe.com/userfiles/file/17807205607.pdf
    • http://trans-serwis.com/userfiles/file/95619926433.pdf
    • https://hzautomatisering.nl/userfiles/file/gabodulizikanujafatafijez.pdf
    • http://otevrel.eu/ckfinder/userfiles/files/61898878464.pdf
    • https://twinscooking.nl/twins/userfiles/file/pixixukovisijexunidu.pdf
    • http://dush-kz.ru/uploads/fck/file/wovegovakika.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/jroqqfiqv0nnd2j7af6akt4r3r/51386877638.pdf
    • https://darkoyunpin.com/calisma2/files/uploads/tebizojaxagazolas.pdf
    • http://dioceseofniranam.org/userfiles/file/57100640550.pdf
    • http://thumpamonpally.com/userfiles/file/63346800264.pdf
    • http://cgl.lu/userfiles/files/47208131002.pdf
    • http://brenno-tojestto.pl/userfiles/file/rasez.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/pekawagalid.pdf
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/zujajog.pdf
    • https://thefertilizerproductionline.com/d/files/dojofevu.pdf
    • https://venus-forever.com/image/files/22037411932.pdf

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