Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d0e9fc67673a4d…

MALICIOUS

PDF

94.5 KB Created: 2021-06-14 09:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d3838f0f146635cf7bb24ee0457d838 SHA-1: 89ed522ca335a4181cd9d09780770a1f20da3006 SHA-256: b7d0e9fc67673a4d3e1b580a41ce2e4e972cbe7666387237aee1af986a2cf8c2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malware or facilitate phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pixomot.ru/uplcv?utm_term=randidangazhi+novel+pdf+in+malayalam
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608531456f541---95292261684.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/2e1vq31dhn1s7g19gtol1st2gs/dozemurikofetubujifetim.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ecea1b1e7---savefoxawajakenabikefo.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607676a4df538---51491678712.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16082069a6d796---sesijuvoxotiji.pdf
    • http://www.dereformasenalicante.com/archivos/files/gizifi.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6cd1e1a42---84226781230.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/af89533f0fca34da4b610090e3fbd360/jotulawawelumaxuli.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/9e30b0bfb9109363c8e893e18f3017b3/goradekobelivutukit.pdf
    • https://noddy.nu/images/file/89766218688.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/fd664d50e009f778bb505c00c08b3e4b/koreliwuv.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/0qhj4h8n0tgqlnujtthh9k2vr9/69359569715.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/9812f623f73c177b0a2d9856a02a7c7c/tatugujixomogipusonosug.pdf
    • https://mariapolis.net/ckfinder/userfiles/files/57227953195.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b054c2631ec---80945414188.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/j6au9isg0tk3p07db0oh81u4tq/tobapugujuromoket.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_off000136c3.bin
d5774d2bcbdce69dfd54e37f6cf9a0882c689408c7a13e9a008bc68df8dd9c3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136C3 5400 bytes
font_01_sfnt_off00014923.bin
97534eef9d6c6d6cdb9ac07d9db340693c860428f11900173132f9770cf5f5b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14923 10520 bytes

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