Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3524a730101c3f…

MALICIOUS

PDF

74.7 KB Created: 2021-06-10 13:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f68d8957769815e4863297ee86059e1 SHA-1: 7a80c1eefec5bc557469ea8bd3b3b40883d9079e SHA-256: 4a3524a730101c3f5cbda7672a2e61f272e4a64b9efac8b27e50533b6cb7080f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document employs a social engineering lure, masquerading as a PDF compression tool to trick users into installing malicious browser extensions or updates. The document contains numerous links to external websites, many of which appear to be compromised or disposable hosting, likely serving as distribution points for malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, and the embedded URLs suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=compress+pdf+500+kb+online
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca21997426---87171631063.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/466408a0053effb26c7c08287d6b21af/9170323509.pdf
    • http://rustproofingottawa.com/userfiles/file/98913918003.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3e381111f---13689739485.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084d3f7cd524---liteximevedurotamur.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/0568dace9e1584e49ef1dab43f98cc26/lejoza.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/fa62ac76d8bb3fd5fe6bc4cad7e6ce23/11142358533.pdf
    • http://expertsystemgroup.com/file_media/file_image/file/24427722754.pdf
    • http://cuatudongsaigon.vn/uploads/files/banekekol.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b56a6c3d062---82373148727.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075e2d06f91a---zejixiteviwitijuvore.pdf
    • http://navigator-33.ru/media/file/68472824133.pdf
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/sesapobipavexoxiwufedim.pdf
    • http://goref.ru/files/file/bujizuloxe.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7383c83443---96020853037.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/0dd91814fba57ac7826a6f91cb770daf/75324401663.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000e6fd.bin
6584e9bc6425df7c5c3ccaa1ca535ad37212e063857c193766514d40344f10fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FD 5352 bytes
font_01_sfnt_off0000f91c.bin
515c356c99d875f33fd7c2e0e15ebeef45c11f60b856d74be816957af2175a1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF91C 10804 bytes

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