Malicious PDF — malware analysis report

Static analysis result for SHA-256 216491700e8741ea…

MALICIOUS

PDF

73.9 KB Created: 2021-08-20 11:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 24394b66cf0f4207503477632e1bccaf SHA-1: 1b41c90f094de62bfd6a9afbc57515694b19a626 SHA-256: 216491700e8741eaa678046293b9bc358a5179a522aad18474458e4595b5252f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://synerhu.ru/uplcv?utm_term=space+wolf+codex+pdf+vk PDF link annotation
    • https://fentesmakina.com/paket/upload/files/59441609103.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/430376430c13b3cfdee02f57c6fc155b/jodopujiworonopavimu.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/82711808684.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/26423541817.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/boraxuxigepalidivekar.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/802c4c5b0379a6c84c2099372822d8c4/tidazanikoduxorarev.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/66705322241.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160989e4adf4f0---32331086106.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/linaxubupetirixedozofab.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/27e7051879ea1d7f46a05e15123df1a6/lifewuzobexukeri.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/803c0b89908719db1048df1b9ae12aca/zimomapewuralodirodijan.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/63108208844.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/4jm2jeat3n1dopgdicg3jaqbok/51041982201.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/ladiso.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/24539409976.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/37252552159.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/mororizakozojiposi.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/52741412928.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/69120074058.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b04bd9939e6---53595569308.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16086ebd92e63b---11619972411.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD725 10472 bytes
SHA-256: 9003541f8dfe70ca3d74b09acd611d7570a287311be47d9dd3c2ce3c56c9284e
font_02_sfnt_off0000ef26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF26 16580 bytes
SHA-256: 3bc288e2f1e32452009ac015ed49226d50ae233019c2187f6c51364c6f890641

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