Malicious PDF — malware analysis report

Static analysis result for SHA-256 7246d8c75b1b0426…

MALICIOUS

PDF

83.6 KB Created: 2021-09-06 10:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fff5613fa1a63f394d7cfeadcb3c137a SHA-1: a80d994b029236d316311758a9cb71ba31c4de81 SHA-256: 7246d8c75b1b042605883840fdb47a0e9b77ce9ca673d9d6fd8d53e5e5973838
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a large number of external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://irlanc.ru/uplcv?utm_term=javascript+manual+pdf+2018 PDF link annotation
    • http://grafichesirio.com/userfiles/files/pupaturularajipowe.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161045a2a9dbcb---dodetulor.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99076002536.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/aa4a97a4e82f9424b2fdcb91c2399b44/muxizo.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/fopusupef.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/nutanafidepopewebepumuj.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/65509199270.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-8-6/20210806020022388420.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/vuzuzodosejibeworituj.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/54238115827.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/jop1o3okrm3psceac85q028m0d/59966256258.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/91626537040.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f2392146b43---15643427181.pdfIn PDF document text
    • https://btegypt.com/file/padimu.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/5380c930f343ae7d64dd9cbd10504bd8/36211013746.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/c3a556f4e97d71663329e59cc69a418a/4611831413.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/bodefukugak.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/koxipijebopijiruziwukim.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/fixutarabafax.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcbbee5d70---20646479337.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/tosovu.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_off0000df9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AC 18136 bytes
SHA-256: e176c3ab14089b6db7b2db83b61759bc1618091607358c50dce15831a71fe58c
font_02_sfnt_off000126f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F0 11188 bytes
SHA-256: 9607d4f75d07417a87d8733cff4cda9e90249217d38e1d4286eb7db37a0d7044

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