Malicious PDF — malware analysis report

Static analysis result for SHA-256 4732b4bdfc5742ca…

MALICIOUS

PDF

74.6 KB Created: 2021-06-06 03:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fec646d15fa4305256c5954d0a36004 SHA-1: df63f210d07a0c0466df476231faf5789b43146e SHA-256: 4732b4bdfc5742cafd5d20578127f19c6c61c0279451d353de215e0428fa3abd
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The embedded URLs suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://laborke.ru/uplcv?utm_term=how+do+i+use+my+farberware+compact+oil+less+fryer
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876b0dd35da---80862505399.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2c3c27cd8---pojusawagipuzedifopelu.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/fee85c47e292adc40a5d4a7d8c8c7ec4/61945341429.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/7f8133ea1025427aa07bf2e1955796dd/divomabowubov.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b90f01267b8---36200616475.pdf
    • http://marljivo.hr/userfiles/file/malopokakalodegilasivofa.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc2119f03a---kidavil.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/0d12b7eee6fbb09e85edda6065060b89/69282837714.pdf
    • http://goldenpeak.it/userfiles/files/gavuli.pdf
    • https://ktmcollege.org/public_html/userfiles/file/legaropewekiramixaxaxoti.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb9e694e8a---wukaka.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/01c1c8aff86a70ad02811ab4e57c0cd8/moxopukededofe.pdf
    • http://easyreturn.store/userfiles/file/neloge.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a48573e35---bupavefijixix.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/03fe646f3949baffade241f29ae1be6f/zejuzufogefobelufut.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_off0000e3ec.bin
99144772d8a910f42e009928d3f7ac106e2bd54df446e93b032272d52c3da048		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EC 5596 bytes
font_01_sfnt_off0000f6ee.bin
7cfe70f0e523627ecd29ac2929bcafdd6cdb8cc48a7b69461a1ff92ad19b3011		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EE 11384 bytes

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