Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1f15e81713dc47…

MALICIOUS

PDF

65.7 KB Created: 2021-09-18 15:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32935efa45eeb01ff9ece1ba421174ab SHA-1: 1af59c6044a299a4098f462cb3e2fbc0b164885e SHA-256: 7a1f15e81713dc47d15adeb0a22d14ee6a1bb6304eec511a0ad5609f5287a378
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains an image-based interface with embedded links, likely intended to direct users to external sites for credential harvesting or malware download. The presence of numerous external URLs, many hosted on compromised WordPress sites or disposable domains, further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5526

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 65 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://infrive.ru/uplcv?utm_term=add+followers+instagram+apk
    • http://marcth.pl/media/fck/file/lupawaxigipinur.pdf
    • http://hairfibers24.com/upload/file/foranefipebowegu.pdf
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/leniderofeloloragetu.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d48039273---25344637819.pdf
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/zozew.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161435e2793a8f---13251629191.pdf
    • http://aotwresort.org/ckfinder/userfiles/files/lamorufulelemevew.pdf
    • http://pibar.tw/uploads/files/202109092110455259.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/4ed2407e147bec4b5d87b15fb1335605/79653477290.pdf
    • http://gramercygrand.ru/files/file/13266079996.pdf
    • http://hurtmar.pl/Upload/file/37386653959.pdf
    • https://drhuanghair.com/uploads/files/202109040257444687.pdf
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/nuzunaviwilunolezabumomor.pdf
    • https://digiconelectronics.com/media/59990108282.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b33a00dd56---pefopoza.pdf
    • http://amdind.com/userfiles/file/kokajuratizimek.pdf
    • http://letdentalab.com/img/files/77519438808.pdf
    • http://www.srijonihealinghome.com/fckimages/file/20708801334.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c809cc859---wujojezazafekeximomi.pdf
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34283631425.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315fa3871f9---99503581685.pdf
    • http://icltindia.in/userfiles/file/jefonukuvezedejanavir.pdf
    • http://rcsiprojectracker.com/userfiles/files/80568671604.pdf

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