Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8e8c714e80da86…

MALICIOUS

PDF

89.7 KB Created: 2021-09-04 01:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5de232a41f18f32a0ce0bdffde070f74 SHA-1: c0ded871f8dd1bd1ee295201f2070143e58ed832 SHA-256: ad8e8c714e80da86a1bf7046e2b21fea6da3ce11b2212a19a0fa2ae235b14d9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://huntic.ru/uplcv?utm_term=what+is+gestalt+therapy+pdf PDF link annotation
    • http://immobilieninvestors.de/userfiles/file/21995092663.pdfIn PDF document text
    • http://greenbrier101.com/userimages/jikodufuxibikusa.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2pdhnddjus7pu4re9vhmr99713/gepamul.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/femigixupe.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/70995488041.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/96520965f80dd186c7488dea5eec771a/zifenu.pdfIn PDF document text
    • http://tiquital.com/documentos/file/5536627914.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/lubugezagi.pdfIn PDF document text
    • http://epmachine.ru/d/files/jogeriwezovilut.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/c6a19679f9bbc7a20401c5a4582c99a9/61306363161.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/0acf13c7f4210250cd497184e081e9e4/sovezosakupalunaxenexu.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/napefabizugilasigasu.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/93941681929.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021050509311573499.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/d7c80d3e4701d4e46957da42522def96/40235983914.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/b320689a95404694e5f3e6c15fd52704/68586619569.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed63b81404---82276461677.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/77170872312.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/fukubakobesabutaso.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/11020388065.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/43262500217.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/106e6330243e120888779eabe4aa95d4/kajafete.pdfIn PDF document text
    • http://gabortech.comadmin/file/gexedim.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_off0000f8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B9 10660 bytes
SHA-256: 06d77d64a1dad2639edf8fe345ecdd24642e203e29d8b111d20a2c5aae42dfb6
font_01_sfnt_off0001110d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110D 18604 bytes
SHA-256: ccba686265d316855162f364c2f91383b48086c0c5d26058bd21ee52db927188
font_02_sfnt_off000141a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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