Malicious PDF — malware analysis report

Static analysis result for SHA-256 8434836f4a85531d…

MALICIOUS

PDF

74.5 KB Created: 2021-06-09 20:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46958180cf1cc8f374f515a309996faa SHA-1: 3888d0bf6e1a5010469f56032ab8c139c4a63a43 SHA-256: 8434836f4a85531d1a7ef79c6ae8a494d8726f93619dd0073f5dee53fec57154
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and the nature of the links suggest an attempt to lure users to external malicious content.

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://nomylo.ru/uplcv?utm_term=free+final+cut+pro+lower+thirds
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d29886920d---93321707730.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092cdc1b0745---manupozatowawali.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/3mfr68mjuq8m5c4256i1630cqq/zumazibuguwopoxiduxisuvad.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f746d8fed5---nejoresekawuku.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/3795aec5aadb72bdace4250c48596779/texoxiravasojuti.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f16d5629d4---41863861802.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/1f5ca8795dba8f3cd35e177252b401af/zezuxodelud.pdf
    • http://songiadahoaian.com/upload/ck/files/tanokozigufonudomawege.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9652f0b7f---xidaxibaxeragox.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/qa256g4821lbh2be70dp1jo303/67427687579.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/0f7ca45ad2864e5f8104ade5d4640ae6/52372378101.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/0ac7cff0be93b6e5822e96d411bbc5e6/75827550427.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/a907e812bd0c965fba33d56ed47e9171/56880331247.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824c8d60e64---lomaditafanofif.pdf
    • http://aeronautike.com/userfiles/file/devitukenetoxexugogusejox.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a87ed2d456d---pufoxuvurovep.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_off0000e763.bin
3157b93502800ebb0bbfb7a0a970d7f5071b6c38a3c9280850eee5808b057f44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE763 5292 bytes
font_01_sfnt_off0000f96c.bin
e6a0adc2fa6eab251dcfe5bfc0e77c7015e42466094eae63caf5f4e3d0dabdbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF96C 10504 bytes

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