Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2694b1ea30c3dd6…

MALICIOUS

PDF

76.2 KB Created: 2021-08-09 10:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cb293c80cab7ce0c023ae2c67bab8bd2 SHA-1: 60659e0ef346283f32928868541c28ca1734f5a2 SHA-256: a2694b1ea30c3dd67f7a87127b13144727281f14ca09b8f3b7f5762a033ffee1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's designed to leverage external resources. The primary purpose appears to be directing users to potentially harmful content or exploiting SEO vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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://garglob.ru/uplcv?utm_term=sinopsis+de+auditoria+administrativa+joaquin+rodriguez+valencia+pdf+gratis PDF link annotation
    • http://soldearenales.com/galeria/files/rowubadenibajo.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/zixejuzumogo.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083477232701---tarukogibone.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/zepejotovakizibim.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/77008159164.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/jupiva.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/62662507606.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/185377261460d494b1b097a.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/022b0343f29589dd2741dbc2db9665a7/28878101726.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ke59d9idbchbhj3i6i9dgbflfu/93629708936.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/navijuponoju.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/gobujiwu.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/91310332307.pdfIn PDF document text
    • https://digireg.org/upload/6075370269.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/10865367331.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/86276276477.pdfIn PDF document text
    • http://oroszvilag.hu/userfiles/file/gojufovalujim.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b55c20120---85018252144.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/ruxupozevijaj.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607371f14c8a0---60794483484.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/626ef5534df5c1a0aa442dd7273f360d/81634240265.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/2a72p3jn8stgtorq4bjt592sq6/15499307678.pdfIn PDF document text
    • https://topplene.com/upload/ckfinder_temp/files/20210611123106.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_off0000bfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE8 11540 bytes
SHA-256: 4d4355be4f622a08af6e879b8a6daebf26c1ca7fa0b5fe0b255293519db9a2d7
font_01_sfnt_off0000dac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D9 17564 bytes
SHA-256: 0720bfd7acc5411ac375e294428de827ebbd7bce3da193bfe02a9368504abab8