Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3a17cbd7d430ad…

MALICIOUS

PDF

73.6 KB Created: 2021-06-18 11:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a07e210a293b5d55ffe710261c53d38b SHA-1: 3802f661990dad2fa84869ea80ac07b23b0d52cd SHA-256: 4f3a17cbd7d430ad7aa233cc318f858fa3495697f0c1b1b4c1cb0d863a8e98ca
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which appear to be compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The 'SE_CLICKFIX' heuristic indicates the document likely instructs users to execute commands, a common social engineering tactic to bypass security measures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://crewmak.ru/uplcv?utm_term=how+to+split+one+pdf+into+two
    • http://ecogestval.com/userfiles/file/pununuwalatomizugin.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/o88orqbnobkmeidiebj5mi59o9/47433823968.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9be1c49749---nunazamadokavaleba.pdf
    • http://accessprecision.com/userfiles/file/53978980918.pdf
    • http://aeronautike.com/userfiles/file/81134845225.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/8hv0ggmodafui5u1b5udnukilo/36947920751.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/addee0e24c049ddf8693e7047fed053e/46683823286.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5fc1c85d---waxelokali.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098f6922f4d3---pulapu.pdf
    • https://pui-vital.ro/msg_media/file/53493567292.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e386d0fd7---42300612207.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765a0419899---xulebe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfca.bin
83d721c8c8461e16ce830e76eb0e63f2c73e35c95e728556f934d619a0477df9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCA 4784 bytes
font_01_sfnt_off0000f038.bin
7d714bfab0284c26d7fc73265418716d2d6bd20dbf969d850231bf082734cabd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF038 11776 bytes

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