Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a091e55c08d4d59…

MALICIOUS

PDF

79.3 KB Created: 2021-06-13 02:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15752654918d095bcbfe124efc366641 SHA-1: 33ffeb3e8de2c9a2391157c507f957f929df46a7 SHA-256: 1a091e55c08d4d5919ba2c8947c67f6cc0d71f5c1e6c5117171a466a053bf6c6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external URIs and link farms pointing to compromised websites, suggesting it is designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=important+frankenstein+quotes
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/3086dd9f26991964058e4c9db83016aa/36192692159.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16090f7d31c354---49933372210.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b55c8f07b---kuvagakop.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/65e9a96b55535418b3d322fd7805f399/bazimipemopafuzul.pdf
    • http://charivne.info/images/file/35177227803.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/15352687166.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f35952b81---51510132557.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff1333ec80---piluwivixefazogopiti.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aec425e35cb---negubidezefezidulupevaz.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160903b2ab6e14---girawubijuva.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d9737de64---ririjeb.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f174c22dae---31598285456.pdf
    • http://palenice.net/obrazky_clanky/file/resol.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab93eedb5b6---68044054683.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/a42d8d4cf4acab6a89ac4668933189a7/94500175116.pdf
    • 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_off0000fce2.bin
a810ac217c803fa1a7eb5777e7c3ea2a01e7915a589cbe0cde234490477bb63c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE2 5144 bytes
font_01_sfnt_off00010e50.bin
e6271b16fe147f21c756529158854d863cc8c870e1ce3583c5923f377abc75ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E50 10400 bytes

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