Malicious PDF — malware analysis report

Static analysis result for SHA-256 e860d4231203162c…

MALICIOUS

PDF

71.5 KB Created: 2021-09-19 20:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ee7f761351e1b6d8d61496424169ace5 SHA-1: 924a15e91bca612395b27c156c6a27f80ce866be SHA-256: e860d4231203162cd6905e8e99492ccca60b987517296ead6cc69c72706f432f
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9156

Heuristics 5

  • 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
  • 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://coretry.ru/uplcv?utm_term=onbackpressed+close+app PDF link annotation
    • http://61kidsclub.com/userfiles/file/79479836257.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/af5011bf510c03ebbb7c0f1ea5dd91b5/74765503451.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/86413851269.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/levubinaz.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/65720612413.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/butejibizuvove.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614016ecf087f---gosubemigaw.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/nonozizerodulimulatar.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/65944380793.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/ruxudexenijisedipapepoki.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/24373925894.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f43873a51b---ginofeferilojopozamulupun.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/tavekejifuredokonotipe.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/fadedofipufopavavo.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/98758900942.pdfIn PDF document text
    • https://ekransamara.ru/files/3327709409.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/26878346958.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/49727847242.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/81227677266.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/rutugoxupo.pdfIn PDF document text
    • http://secoinblock.com/upload/files/gajewujewomu.pdfIn PDF document text
    • http://castel.lu/userfiles/files/47120855892.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/83945853309.pdfIn PDF document text
    • https://everestart.com/images/stories/file/31918027074.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc11c3ab45---berumiwomugekivifabu.pdfIn PDF document text
    • 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_off0000dd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD41 17748 bytes
SHA-256: 41016d99a90966239b07dd480749a2603ee3bb5cff92b2c69afcc824ac82ac50

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