Malicious PDF — malware analysis report

Static analysis result for SHA-256 04043e91a3c652ac…

MALICIOUS

PDF

77.8 KB Created: 2021-05-12 17:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be78523e850f794485770ff7f899c1b0 SHA-1: b0d6a6c0909ea48e1bcc0555900d6c50858ad2e0 SHA-256: 04043e91a3c652acb012c46830be49500342606293f645ff0c96c1f22ad2bb64
196 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics, including a high-confidence ML classifier and a specific rule for advance-fee scam lures. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and heuristics indicate a phishing or scam attempt, likely leveraging embedded links to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/5p1u0bf4p8g75pch72sep89c0v/59427193425.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5bd47afe2---81007403241.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/3fc2d3d1bfdf4b20755d16001e74e033/gafapuxuk.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/n861gnm6r26il5kmtre13dl086/52323565208.pdf
    • http://boathousebrokerage.com/userfiles/file/51908852689.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc9b619948---jusof.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/9267c120e6c0c74a49eb99edb98a556a/poregiresagezoxodega.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/ccbaf199a8b3c8f594eabb2cc7e6564a/67227050577.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b188f94f90---73599837242.pdf
    • http://anthonyvienna.com/sites/default/files/file/lawilisofodu.pdf
    • http://all-pass.com/folder/editor/file/faxuvirigasejazorigabosi.pdf
    • http://albino-pitti.com/pub_img/file/leribiwinukilotavosolom.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa2e25aa83---50962516206.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087980c95082---tamotujidivokez.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/7160aaea2850a38447620fde5b01eb42/jifinagusukaluvubipodo.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf2aa201b0---19937060429.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=animated+wallpaper+android+phone
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4f7.bin
ffe3d134d2354bb1d46643fe4140abe7f3b3aa29c6d4249ada917c704813ae3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F7 4892 bytes
font_01_sfnt_off0000f567.bin
245f65e35913c9f8ede5bfb2871d4571438179fccec5af77df68719760a99620
pdf-font-stream PDF embedded font (sfnt) at offset 0xF567 11396 bytes
font_02_sfnt_off00011c48.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C48 4324 bytes