Malicious PDF — malware analysis report

Static analysis result for SHA-256 6948229dca391ef2…

MALICIOUS

PDF

66.3 KB Created: 2021-06-18 00:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e0de170b05135df79cc5c0f2a2fdfbe SHA-1: a115eaf67bd96588e234fe67647373980ccbef47 SHA-256: 6948229dca391ef282d2a845eb32edd7bcc647374fd17861b6e01add118af8c0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The embedded content, though heavily obfuscated, likely serves to redirect users to these malicious sites, potentially for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://allytemp.ru/uplcv?utm_term=castle+crashers+remastered+boomerang
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/51e5a425f87a3cb13f7d4f75ce45f9fa/91992705676.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2578f3cd8---28868476400.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a32a2aef68---93826248569.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160820616eac59---sagexajusekubukadan.pdf
    • https://etonbio.com/newsLetters/images/file/fodigowapili.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f40209d6b---sodejubesuvoxegawa.pdf
    • http://abwpetersburg.com/uploads/files/jewut.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/tgboov0uelughc0kgejboteh9t/xemedunu.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/mg8628ve10tpge8icdfb024oii/42889816995.pdf
    • https://dalilak1.com/userfiles/file/zufubuz.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d07dd93ca7---39918395168.pdf
    • http://t-p-fortune.com/userfiles/file/88427847604.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/e9957f90c5c47afffe7c541563a1d8da/sorerojimadosuvi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2af.bin
bee58b9a70a056401987573a147f04830e6d19208bdb507250d15cbc4d0c7531		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AF 5396 bytes
font_01_sfnt_off0000d4ce.bin
b31bc2d71256fbbca3ef82348edc358ae3df5cfb24aa949effa0e9d47f5f633f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CE 12484 bytes

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