Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac42526ffb931a3…

MALICIOUS

PDF

65.1 KB Created: 2021-09-02 02:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c26421bbd2b2a25e3947238089aaf318 SHA-1: 3bc2a97a8d4492b13303bf0a4daad14f73cb63bc SHA-256: 9ac42526ffb931a30539bb8643c28394ced8dcaaf88fc5d96842c90327101905
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which point to compromised CMS upload storage, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves leveraging a link farm to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9193

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 http://schroniskoorzechowce.pl/ckfinder/userfiles/files/tepogab.pdf In PDF document text
    • http://erpos.sk/data/files/sadaz.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/73655169608.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/23646769925.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864b43565ed---25166703986.pdfIn PDF document text
    • http://ddrwc.net/clients/869849/File/lugapifiwova.pdfIn PDF document text
    • http://kleiberit.ru/files/file/58416397773.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/tdp9or7c9990fec6m46ditt951/64252446921.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d0a3080c4---tazeguduparegezi.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb02b777b8---4370978705.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0cdc1903c---93180167614.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/11126906145.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757e7a43f15---lavegomeboteno.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/c079e33a2c980f54a3d59088bcda458f/zunatiwuxa.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/fc020ba25fa0aad01bb2b27a48720f81/lomipubumilirova.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a062149cfd4---silasubirupozukixofu.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/76667404757.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/97065898159.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/bd0e40a29c302c6c7663cc16b3a16210/ketilomigedutudigaboroneb.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/75a9750e46234pgrgdoauup9d9/toledukupitoj.pdfIn PDF document text
    • https://pasarangroup2.com/contents//files/16297068666.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1611b0ad56ce3a---75510391621.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16121cc468c561---vumifukajufivinabof.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/podufadebuxudugukitevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=45+pounds+to+sgdPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE740 10252 bytes
SHA-256: 447759126f0d91cc7bd5ecb93f3da28b8381c94c597d5cccc0680f67ef8ca881

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