Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae859487ebcb12ad…

MALICIOUS

PDF

72.5 KB Created: 2021-06-10 14:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 460bb99d1e1d25915fb77e416dc11950 SHA-1: 6fcdf7a1d78b30115165832ff3c44d7d16f01025 SHA-256: ae859487ebcb12adca705cf19c0acc329dd1fe19c0f0a16b46a12f8bccca32e1
156 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, and contains numerous links to external websites, many hosted on compromised CMS platforms. The document body, though partially obfuscated, suggests a lure related to downloading Windows 10 Enterprise ISO, which is a common tactic for phishing or distributing further malware. The presence of external URIs and link farms indicates an attempt 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://irlanc.ru/uplcv?utm_term=how+to+download+windows+10+enterprise+iso
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be2ed06ae07---27186176081.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbaca9ea23---21535078338.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/f773o80dn9onu6q4jufglf3b64/zigujomo.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebf8956766---83431475196.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/8iae3l94elg38p8dsfiknmglti/4523538268.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/c4caedf007e9a22a01bc64264f4696c1/461376244.pdf
    • http://zaun-produzent.de/userfiles/file/59182709070.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4fa84e5b9---lilaxotegefinogolojanovi.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/0ed9e68dd3d8fb010b42a46795fad183/lafadijogeretexogapokisop.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd40c23834---32896310925.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5aea18d65---55612742486.pdf
    • https://aspaeng.com/files/image/files/37060416109.pdf
    • http://greenbiotech.vn/uploads/userfiles/file/lovikatowu.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/59981500430.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/9c9681df983783804d1c13356c82b078/fikejamevob.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_off0000dfe7.bin
559f72e02e2c8649071d6de39d57f60de4c9a1aa8d9f88de3c8c72810e175b25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE7 5200 bytes
font_01_sfnt_off0000f1b4.bin
8d43c0c2ffbe68547d96e1798d3196b55007a5da13e7d3c4c502e38e65d1622a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B4 10544 bytes

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