Malicious PDF — malware analysis report

Static analysis result for SHA-256 1038358a17454d8d…

MALICIOUS

PDF

70.5 KB Created: 2021-05-10 18:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f4e20c6a9df9832d9eb1692791dbda1 SHA-1: aff346b9ec1350a535173c0db3cf9df73e474fe6 SHA-256: 1038358a17454d8d06c10fdd982a4c46d60674ea8e4219c2fa1e63c4f03fb5bb
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. The file contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing operations. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious lure designed to redirect users to potentially harmful sites.

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://laborke.ru/uplcv?utm_term=sea+to+summit+tyvek+ground+sheet
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7bb1e468e---wofador.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/f6d95c8e43145d83185f93e488a32f9c/92790478979.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/3631ac14b7d66b095821ed4b986f0c67/41530408472.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609841384b913---30053766282.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608850d018187---9340942382.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160822aa4d4723---16986256730.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16093e1aebd31c---31461052041.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/rh0tqij8186l3jhgqpib6ijli2/dulanokuroruwizudiwexo.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c0cadeb4559ee4f56ebbecc0c1a3d1c2/17199506182.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/fd780de60398f0992cae84acb4be232d/mupatil.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607778cfe1a92---vilowukefekumipidatara.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/8beeac7c2e8d27bf3fb1edd5bdb2bbfe/36409756434.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608076789b969---vetapegiletoxojamoguj.pdf
    • https://aawyx.com/sites/default/imageuser/file/80387752576.pdf
    • http://ahkjt.com/upfile/file/39700911613.pdf
    • http://oreade-breche.fr/userfiles/file/95185735943.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_off0000cc8e.bin
7d8d1e507da5869019a7f90f2f9efca9f3f68bbe5475bdeefea6ee7b10ce9470
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8E 5536 bytes
font_01_sfnt_off0000df3e.bin
71b38d7bbd3f9742ce9a0bda7dd86c9d8408fe8413dc69e95eab3a099c1200fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3E 14812 bytes