Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c44d4be5b87681…

MALICIOUS

PDF

41.4 KB Created: 2021-09-29 02:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6d9ff27f0ee7e52265809112ff79775a SHA-1: 21ffd7fdaf74263e32bee6e79324b3ed22a05918 SHA-256: f8c44d4be5b87681a82e3891af83c90cc22eec892196219c06d033c500c98eba
174 Risk Score

Malware Insights

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

The PDF is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot designed to trick users. It contains numerous external links, including one pointing to a compromised WordPress upload, suggesting it's part of a link farm intended to distribute malicious content or phish for credentials. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 41 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://ketchas.ru/uplcv?utm_term=mobile+network+booster+apk+by+buzzinfotech+free+download PDF link annotation
    • http://movesearchesuk.com/userfiles/file/23907868586.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/45596993145.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/59219391505.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/gazanoxikomirinevegamame.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/79575588539.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/wipadopejubigilowow.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/c9gnusthib4id0nk0ghmug1qps/rodikavifurofines.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/fefonekelemefuloki.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/fapezavikure.pdfIn PDF document text
    • http://chinazzjx.com/d/files/zobimuzigixosexopab.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/ferenom.pdfIn PDF document text
    • https://teamcode.net/upload/files/vexikeloruna.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/52391292987.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/remasoxozirosajivenitowi.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/vovumapukenim.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/robubetegojazubapeludax.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/87239748821.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/18411325170.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614d456074b31---tinin.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/punezejik.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/kovosisufixonurufanazoso.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/pomadutibim.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/57021840592.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/98f0a525edf377b9359829a0fdae683e/59637749999.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/kavapo.pdfIn PDF document text

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