Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98a69d4d4543906…

MALICIOUS

PDF

82.0 KB Created: 2021-08-15 22:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9b2518d4e46e8d50021e1f7eb08970e2 SHA-1: 67a3bcad6c02c57f089ea02fcf0c1692721787ee SHA-256: f98a69d4d45439067f53910f919eb4345e7640851f3a6294c59ffc1fc452249d
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and ClamAV as malicious, with a high ML classifier score. It contains numerous links pointing to compromised WordPress upload directories and other domains, suggesting it's part of a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall pattern indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b35f2d631---gomojuxufexe.pdf In PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8926c24ca---175363550.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/9740511434.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/71883827569.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/vigowovevaw.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087d9b1ad682---47940271520.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/92065539929.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700fd06f72d---veguzonewifutakiga.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/32890783580.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/81045427110.pdfIn PDF document text
    • https://businesslife.com/content/file/sujowewi.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/30357420021.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/55337465693.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/95b3ad3bcac331547b89acc7bf04ca11/xowiritobavedovuf.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/208619f750ed8d2a0130aed0568774ec/11891077941.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/vibiw.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c968d1e64a7---fepidefaterut.pdfIn PDF document text
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/teludijo.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/6b3f2712b35ff54a38984d87fdd09224/21561105745.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9a6fb085e44cd23992da33997a520789/koluxelidotu.pdfIn PDF document text
    • http://dgjst.com/upfile/file/67117096323.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/fexabozurub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=printable+brochure+layout+templatesPDF link annotation
    • 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_off0000db77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38E 10992 bytes
SHA-256: ed6ebf479e76ecc30aa2b17e7d1effa515962e9404c4990a550683bf5719b038
font_02_sfnt_off00010cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB0 17104 bytes
SHA-256: 75945a0c554fd442c120bea01754b475e554633a4accb945781e08eff12e936f

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