Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8c7f2143ea73f2…

MALICIOUS

PDF

39.4 KB Created: 2021-07-01 12:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 1172d64e19d96dc2e4fec4dfec3b5019 SHA-1: cf43e85437f0650e0f577d36c19d4c2cd55bb795 SHA-256: 0b8c7f2143ea73f26dbe2fcfc7f7b5df4033eaf50113b29a618ec8700b8c66bb
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8883

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 39 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 http://asianaccounting.com/admin/fckeditor/userfiles/file/88963160087.pdf In PDF document text
    • http://dfh-consulting.com/userfiles/file/56792980624.pdfIn PDF document text
    • http://skomi.ru/img/files/file/27099366475.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/5256ee5b01d1beb5793acd4500e9c951/75584050637.pdfIn PDF document text
    • http://splogservice.ru/content/file/23849056606.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/i112l9bb33asjp3ng72beal7th/jodujigefemipirutij.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c8712527517---tijododirizadimerefumew.pdfIn PDF document text
    • https://smithsgame.com/calisma2/files/uploads/82000867616.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf792846989---34492444931.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/60710036224.pdfIn PDF document text
    • https://ikansambel.com/contents//files/61330119097.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/dodudegexavozafov.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/8j8hp5079q18u90bmnqiigu9aq/gafoxolivebitazikatizezig.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ecfd57c38087b3a57b850613e6c04745/kapilemujaboniz.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a0c02c9875e1400080a0f1893f9ef382/44044810686.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/74809842293.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=class+12+physics+handwritten+notes+in+englishPDF link annotation

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