Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4691f69a2d86b51…

MALICIOUS

PDF

64.5 KB Created: 2021-06-23 14:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8bff7ad15e0767b9ea272859026f3614 SHA-1: 0b876513629559683b38af088d2a2ee2a9b599e3 SHA-256: e4691f69a2d86b51875504f42ee964809289c05b1c30a231abf028fb35bbe6af
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 document contains a link farm pointing to compromised WordPress upload directories and other disposable hosting, likely intended to serve malicious payloads or redirect users to phishing sites. The embedded URLs, such as https://laborke.ru/uplcv?utm_term=download+novel+game+over+falling+in+love+pdf, are designed to trick users into downloading further malware.

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=download+novel+game+over+falling+in+love+pdf PDF link annotation
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/0ebba1dde27a7836d45d416fd9228bc6/wuvalokepuvobi.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/b704a46da79ff1c907aaf0617f54c67e/79936772332.pdfIn PDF document text
    • http://irths.com/upload_files/files/poledewiwirepugutumugini.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/23851208345.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/bitela.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/pejejamavix.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/3749687560.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/82cfb6944daa7f423a3730baab52ebef/15368086316.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fcce21d9a---49014337230.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/uplrj62ejdmb7rat4d34o9pkl6/kenen.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/befubagu.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/21584918976.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075a3f60a939---tivitup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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_off0000bc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3E 5336 bytes
SHA-256: 945cd53ff263d30ea71c309f2585ef001ff007a8ebb73d1320c466c764089c02
font_01_sfnt_off0000ce71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE71 11492 bytes
SHA-256: a3efee82aabf11615016ac1045e8f9ea3ffff99a152977830bb5b8d535997d03

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