Malicious PDF — malware analysis report

Static analysis result for SHA-256 7906b800d5b39341…

MALICIOUS

PDF

70.8 KB Created: 2021-06-12 17:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d22ab9cf8bd881921fa27931c97a8e3 SHA-1: 28a5ae46bc07faf8ab0980f72df31c8542ea9fea SHA-256: 7906b800d5b39341d184036672935add640e3fd544f17c6d21b7f18b4d9bd566
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links pointing to compromised WordPress sites and disposable domains, suggesting it functions as a link farm to distribute further malicious content. The document body, though heavily obfuscated, contains text related to 'free download' and application metadata, reinforcing the lure tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://infrive.ru/uplcv?utm_term=everyone+has+a+story+pdf+free+download
    • https://memoservicesrl.it/file/fepelaxudokitunovurofizu.pdf
    • https://serviceservice.eu/userfiles/file/bunolilinebi.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/b3ec6e5c55454e8016bfc31d96b944ec/3648980152.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/e1b618b5d4ad2ee626e16331de495111/robonidokox.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/gn2t1bvmqrjfonniu5ps5eedo8/biloxapibejizopuketar.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be278ff27b0---tipaxaviwokuxi.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/edbff9ccf1aa00557397c0dc823755d3/79567617079.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160803394ac4fe---diviraf.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/80b7be97e02308727839d24cc49cc442/jiwavolapuwatelemopepebe.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbcde36c12---rozezokexunu.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160948ee9efd39---16964012800.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/ro3jocu9amgg59r6h9ajhptc2p/jowewaj.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ba0bd4ef2---53217478493.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/95c67d65f4c130985cd230634729b774/morejam.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/pusspqms7orpjvbt0m5lnp3v33/vujafemozowudamazegivig.pdf
    • http://amphorabeautyclub.com/campannas/file/79162656885.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_off0000d94f.bin
4f71c8af5a8a3ea75404c6e331268903d557aedfc2122979b9552f6fb708b9ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD94F 5340 bytes
font_01_sfnt_off0000eb96.bin
9473d40acc1da209ed0dcf405f734994b38484bac463780a142ab0eadd4a6904		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB96 10424 bytes

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