Malicious PDF — malware analysis report

Static analysis result for SHA-256 d570c5b913cd2730…

MALICIOUS

PDF

101.2 KB Created: 2021-07-02 20:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 041489c9e504f880047bce447f6c2032 SHA-1: 1dea39b02d2e6024a24a5604926dbd7170387978 SHA-256: d570c5b913cd2730022b7fb4e0b9928908668f574948f401d6197a15343cf718
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious content or further compromise. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm behavior and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://huntic.ru/uplcv?utm_term=river+valley+cultures
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/3qp5dtahaj30nd5tjt5bg3a8mr/powebimasolirinekepud.pdf
    • http://accronline.com/userfiles/file/4334274571.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/2tv0k45rkko6v33p4es3srj4ao/70692660579.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/ad77857971e2b9cdf72a62da270f68ef/41104456963.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cad0e81f68---84835142529.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766e6bdcb08---nabefepudixevenakolane.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add4360bb94---86618345995.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160af9655a370e---najefaz.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6761ded3d---72991176568.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4a8d9ec62---rajosapixelotofom.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076cf7ec80bb---libanewinuje.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609a36f783cf0---84605217793.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/4fa646e44bf35aa8b614ac786f1f4e75/ledunukixijegopepamadajud.pdf
    • http://christopherspubandgrille.com/userfiles/files/muper.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d0c057275---29821344617.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/00sgttqtjgn0el567225546pna/40853852046.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c414c312e8d---gikonusasubosokekefaf.pdf
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/32949856435.pdf
    • https://educhina.mn/editor/files/13217033864.pdf
    • http://absolutelyneon.com/userfiles/file/titajulezulenedose.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/qbbkd2hoaa54fajgf8gcokekll/30013496939.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ab644c4e6---62891873243.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b86c2a060bc2d6f7ed3b61f9e7dfaf21/5006746184.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a31.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A31 16792 bytes
font_01_sfnt_off00014243.bin
c1b8e5c6177fe5a9db1c97253e0d1c8394d194a81c16f22e4e8f947143584f73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14243 17772 bytes
font_02_sfnt_off00017068.bin
19866fa6f94b645df182ffce37ef1652faec3e4646bc673c1417558d1217d327		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17068 10324 bytes

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