Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c85b4c668d46762…

MALICIOUS

PDF

67.7 KB Created: 2021-06-12 12:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e920bad4c7b0ea603698287ca0375cf8 SHA-1: 84d1ef9b3bdececf1edc15a426e9f1a489e0c352 SHA-256: 5c85b4c668d467629396777aae56a841c7ce6f8d40abe9f16ab2bf40328402cd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting domains. The primary purpose appears to be directing users to malicious content, likely for phishing or malware delivery.

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=jack+douglas+book+japanese PDF link annotation
    • https://rowadalbyt.com/userfiles/files/senuduzexu.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160848584a7233---novibezugukadagovuzexu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc63eb8336---62867832703.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/4569185811.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608669341344f---46223735811.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/6429154509.pdfIn PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/dca98d2c158119707ec0ff5e4a60464c/74552214851.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/repitafipawabiz.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/25613666067.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/bba52d6452442c5e76e29bc3a9c1bf15/xivudaralemidero.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/98865949029.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f793061e22efbdedaea7724b4102f34c/legefegojuf.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed4a16f7f4---70887256199.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/ba18955d193c81b8020061b7296c0d68/32842121764.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd28d8e716---90362689045.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/45c21f3f1d338829c8b66ed3d2d71cfa/reduwujanumab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBC 5416 bytes
SHA-256: 9876df5133587c7c6b1af5fb9612aaae45e91dc18cf9cadfbd950ed094034546
font_01_sfnt_off0000de3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3D 10536 bytes
SHA-256: b8bfc663ca55dfd4ff72555de07ea6cd0deb73e791d1a8f0a3515c2317eb5dc3