Malicious PDF — malware analysis report

Static analysis result for SHA-256 6292671e686ee7a3…

MALICIOUS

PDF

75.7 KB Created: 2021-06-15 15:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d55cf6f482c6a38e17248fe434636924 SHA-1: a585b9df1dcfa963400f50fe5b1d56ea4415bec2 SHA-256: 6292671e686ee7a37fed7499823f3586d3e6282353e079c391b3a9159bbe6885
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised WordPress upload storage. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were extracted, the presence of numerous external links suggests the document's primary purpose is to redirect users to malicious or phishing sites, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://irlanc.ru/uplcv?utm_term=if+in+bash+example
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/808c5e55ccd8196c95bb9c4e56cbcc61/sadizewuxowe.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/799719b02de0b62b30288c3ee076bead/73716921477.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/iqj08a0ch4n12l3r800u9pphr7/sulanupi.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b259f82f058---xowunojivetutevoj.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/i1ooe5097kaqipj73g0d5lt166/saziperabijizuzosu.pdf
    • http://opakowania-loga.pl/zdjecia/fotki/file/pubepuwutirusow.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86f3c9f42---25480585107.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/9c368a54d57a468e55fe4cf9dde7f3ae/wuxojudonasixiwunuvan.pdf
    • http://elementsgogreen.com/userfiles/file/kivudapujibarinufid.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609842db2bf95---zobegawupetolatafitotubo.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ar8fdaa5vjrhu78l4jpo6nhms0/42587872031.pdf
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/id11v3l57q5hno5j56h4pogha2/pedidimorusenixede.pdf
    • http://agendatourvietnam.com/hinhanh/file/zasawemukanusekegane.pdf
    • http://christopherdallo.com/file/89805939020.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd47f97781---65541448487.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/7g0b5kjrqbef0o489feiue044t/42493009379.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/cd1e74be8a1165aa69ad555723e87a1b/33317333645.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607648db80644---lapanibagazulosi.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_off0000e8ef.bin
9b22924bd66d4572d81609d4f534dbb5c7e572d9f0a6d689754862aeff3212e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EF 5188 bytes
font_01_sfnt_off0000fa79.bin
3cb86d0e043dcde1b2b8999f0fc374a9698c24e1914a77af29f68a122b9a8456
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA79 11592 bytes