Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13662b4ba6c187e…

MALICIOUS

PDF

100.9 KB Created: 2021-09-01 16:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7df244e07b6bdd78e4922d173082f9fa SHA-1: 2a21798e9947d9a279a223cdd3d897162b4a9f24 SHA-256: f13662b4ba6c187e1e109df80472f93cd08b5d71b5c730035fe717e37fe9939b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute further malicious content or conduct phishing. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://synerhu.ru/uplcv?utm_term=copy+layout+clash+of+clans PDF link annotation
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e54d8234e4---voderazu.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021061717452387.pdfIn PDF document text
    • http://mlkscholarshipsmilwaukee.org/clients/f/f0/f021f13c5c598389be7e913a1ae626ff/File/tarizesuzuk.pdfIn PDF document text
    • https://jss-moms.si/upload/File/jazetugib.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/84948206075.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f9qonirv52bs26druloq03der7/befaridisalomojojiv.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/zetuposadajovor.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/26375623314.pdfIn PDF document text
    • http://ruresept.ru/files/file/85811982264.pdfIn PDF document text
    • http://suachuathietbi.com/upload/files/93243346215.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/14028690514.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/b3256e726b0a903be408d4d595d02583/raguler.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/6dkhmn6rutjskss4j07bsm2qv7/94206472088.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/4d6ed6bc4add34535f3b5b78cd5d0403/xodijadekep.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/44727629845.pdfIn PDF document text
    • https://autoskola-scp.com/files/30879587388.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/gowof.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/35551576899.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/16227841410.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611b329eae020---madifusis.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/75419125505.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/gudamimikevet.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/zosekofowosagiv.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/bikusamisujisafiselowener.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000125f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F3 17924 bytes
SHA-256: 27fb3a0602a4765b161fe6fb101057344667033ab5f4c2f92355163fc694ad6b
font_01_sfnt_off000154a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CB8 10496 bytes
SHA-256: 78fcf1ea476e8e8b733ca3d11b2f51f5a7327bdfba2a421281690af2a94afd68

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