Malicious PDF — malware analysis report

Static analysis result for SHA-256 596d7f0229ed4d0b…

MALICIOUS

PDF

73.3 KB Created: 2021-05-27 21:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4c9a5a5be50ab423ac67f4dad9a22558 SHA-1: e6ad4d5bbfca9599a92b89d4c4cbf8f158058a10 SHA-256: 596d7f0229ed4d0b727011557a728bcd79091fdd3fd22712e4638e030c6e6b2c
156 Risk Score

Malware Insights

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

This PDF is detected as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains numerous links to external PDFs hosted on compromised websites, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The document body, though heavily obfuscated, appears to be a lure related to SBA PPP loan forgiveness applications.

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://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/tmc6vb8qjj4pgft3prrb0lnc6i/wiveperako.pdf In PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/7afb5c3cdad384f6c295b64c261fdbc2/79870912701.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/fjc49af37tjbc2eh9fmhofrek2/bozapijokubelonigaposekod.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/baxevazobubo.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/d6bn9dit5cdrt23nugqkub6081/18935267433.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/31ca03ef5fcab23f8d0c827cdb7d381a/72686158446.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc104256ce---rirajenufasaso.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086a480f1b9c---35026895064.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/8813589113.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1c279934e---86737055441.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/93412981462.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd221e489c---wifoxuje.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b96cbcf508---gotejesiwanexesoduloz.pdfIn PDF document text
    • http://allycatering.com/userfiles/wiroje.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/c82edmdr7tab77ev4iqvu850le/78416484252.pdfIn PDF document text
    • https://airbays.com/userfiles/file/kuxupumosejek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sba+ppp+loan+forgiveness+application+fillable+formPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E4 5636 bytes
SHA-256: 72defed6baa70bbe12d0cc6d6c708f76d5fea39758fa9844cfac276b9ad7f491
font_01_sfnt_off0000f413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF413 10468 bytes
SHA-256: 4c167ba5388b5e9e8502d665c72e8ba72bf85706a1f53d06a5e02e60fc364830