Malicious PDF — malware analysis report

Static analysis result for SHA-256 0832bd48ae9336c0…

MALICIOUS

PDF

76.0 KB Created: 2021-09-07 21:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bf5b961983eae695846eabd6ef69f732 SHA-1: a78a6d6c44ee0c6016d2a32d6c30517cff0baac3 SHA-256: 0832bd48ae9336c0b6e65751bd0ebe3b75c0b420293e903cd3c5cf2b13e14f3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic point towards an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=surgical+female+pelvic+anatomy+pdf PDF link annotation
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9a77d4b4d---kujewelixaz.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/46519785356.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/72afc8011d68851c8fbae327d4b0b218/muxiragatexovejuzikar.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/7cd1301c2c5340e5d00e052e02d06a7c/13636219956.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/gexawit.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/da693933b3ab0b84b521ae242fbf6fd1/55416858499.pdfIn PDF document text
    • http://vkts.se/userfiles/file/vefebabidonatovutelok.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070415fcc9a9---saputip.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/2q12co0e3mphtf3jh3rnh3p27n/68338070974.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/gowejoxod.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/7e56e69e2c0e37262b336970dd456b4d/pukawolozusukumedonanawad.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/75b4ff7eddc9d66590d1a0ab6329a4a5/72267414566.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/40043531650.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16129828c474e9---64171933291.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/34107156945.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/24392452871.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60b3ae8c96---65030589547.pdfIn PDF document text
    • http://gardatrans.com/content/Files/rasof.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d04b7336f8---wabufe.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/21ohj5clk7mt0o1chvnou6h35l/sozotepikovuli.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/v40tfa3orm8v5o0vaf89l6uo2n/tirij.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/remujulekerabizutopuvakoz.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c613d24788---sejelaverolujid.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_off0000c37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC37A 17532 bytes
SHA-256: 9ef8a75000be37283475e58f919cd74ab5aa7dc2511d81a44ab9731f80c4fa5e
font_01_sfnt_off0000f05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05C 11152 bytes
SHA-256: fee9bf7f4f09c5eababfb9e2e11be83defc41dbb62cdad32336465793d8f866f
font_02_sfnt_off00010a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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