Malicious PDF — malware analysis report

Static analysis result for SHA-256 07c83517aa858865…

MALICIOUS

PDF

88.8 KB Created: 2021-09-01 10:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e677e08c0e3dcc3399dc00ae1b867d55 SHA-1: e69aa281d7e3de3d23b5c82fd45833c59898c7d0 SHA-256: 07c83517aa85886599df76ec48febe1d95cd30c45f30ec04cd3f1a45b7b9e3e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of embedded URLs indicate it's intended to facilitate initial access via spearphishing, likely leading to further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://oniceh.ru/uplcv?utm_term=insolvency+act+2015 PDF link annotation
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be278ff27b0---tipaxaviwokuxi.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5443a7726---97422349834.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/66081446666.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/fipofobebexit.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/5532b733480755c40ffec33d55be826d/69284022368.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb61d54285---jefamawiguxekevato.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/39088096915.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/kekofikopebak.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a11b402c89d---sesewowavijepep.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/27778553678.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/pomufeviboriwogitomepe.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/zomibijikezatesasugumitat.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/xubov.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/xewekoxizutebejaxomonofap.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ce364bec0---91923789514.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/97899942590.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607add5404b1f---kiviligukal.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074160a80cac---pikiwubisasalokejip.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/vuteropetaxesujifevuvovu.pdfIn PDF document text
    • http://4darchitecture.org/img/all/lisatigijaxuwufixu.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/75160970281.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/73777464462.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/dofexeladi.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_off0000f324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF324 18716 bytes
SHA-256: 3f99d9eaa02cd0e1ea62df09ea2518decac2ae61cb32bf5481fc3c5b31c0bcff
font_01_sfnt_off00012402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12402 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C19 10588 bytes
SHA-256: f8587e81cac2996d2b72e382124d11fa87d1c0dc0c5134bfb8cd40aeec891ec8

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