Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4fffd28b6dd444f…

MALICIOUS

PDF

89.7 KB Created: 2021-07-13 10:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0d308448d5d2360415197722fdb2d0e0 SHA-1: 5c652b728284697b8b4cb81218eb24fae29d768c SHA-256: a4fffd28b6dd444f63df044f1b48582b3d974f289f77cb383a100d635a592763
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, suggesting it's designed to lure users to potentially malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/lqjl43a9ce66qkmnd273lr5nk5/23009235996.pdf In PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072438a295a5---75469568630.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/ip7f7ia1l8g2idslrjrlutlhg3/xidaz.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/6769bf2bb7548c375d60ff5a656686f6/musupowigidivulalifitepo.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/podukomolewu.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/16090612147.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc916d1776---39915263782.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/43918832514.pdfIn PDF document text
    • https://maisonforville.be/documents/file/47482197022.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/60176699086.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/c13257102bc5b3a9f177ae64dc902739/6662710595.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/91054925328.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/f45f2261fa91616fe6d6819bfa03813c/62411858848.pdfIn PDF document text
    • http://abnicum.com/files/file/34171816735.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/bc5pqn9ld07a2fao95dv1n8hsn/dovuzem.pdfIn PDF document text
    • http://gtshotel.it/images/file/28329535151.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/5b4f12a6b0a72ecf204014425532f443/73014574042.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e02f2de0697---68894555554.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/a457d14c54be3d89a50c3a59d4bf2f95/94948725139.pdfIn PDF document text
    • http://riversedgefm.com/files/file/bujigojamal.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608588a36b1f8---60042501088.pdfIn PDF document text
    • http://saglikligencler.org/files/files/kevibevufanumudiw.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/31851577442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=html+include+pdf+as+imagePDF 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_off0000f9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C0 10832 bytes
SHA-256: 0bdd800344387b6228d2b866701ecede793d1de14bcfeaacefdf1b3c61595327
font_01_sfnt_off00011277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11277 17756 bytes
SHA-256: 5a28d95d7d090d4fc426977e45875dc8a64e2a2fa7da6747b7454a21dccd0f04
font_02_sfnt_off00014193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14193 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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