Malicious PDF — malware analysis report

Static analysis result for SHA-256 7440346517fc5ce0…

MALICIOUS

PDF

92.4 KB Created: 2021-09-05 07:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 46aed74744fee76ca20e92b808a6d8fd SHA-1: 4727095a5d7902b66392201c1c8e913626a5c8cb SHA-256: 7440346517fc5ce014e516a52cf5258ef705efa1d36ac7558b0a8aad7aa48c5c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the ultimate destination. The presence of multiple external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' rule indicate a strong intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://smidgel.ru/uplcv?utm_term=horstmann+as1+manual PDF link annotation
    • http://yuanda-boiler.com/d/files/23593256662.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/30191021607.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/98625408313.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/sosorikokowuxepibisiz.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/51814724436.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/53844294771.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/digod.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160874e9c86187---nisil.pdfIn PDF document text
    • http://mosjob.ru/images/file/megebitujezeju.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/67446961611.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/68293732909.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/bguhrmji865n67q68mm8srgaee/90982086953.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a29f1e26583---foramilaj.pdfIn PDF document text
    • http://precisao.net/files/files/xixujufafivo.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb1845f2b9---zasetokiresepobobo.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/dudinejila.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/15773873598.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/wufegitevima.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/76300339036.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088b8c97a16a---92475417042.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/sexeduwagi.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/baziwa.pdfIn PDF document text
    • http://malifer.hu/upload/file/risuzisikitebupitimik.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C7 10188 bytes
SHA-256: 7df650610284237de61e838144987f4bf6eaac15303dc60b503403c91fe667fe
font_01_sfnt_off00011c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9F 18096 bytes
SHA-256: c12814962710dfef208bf2198569b30a83e9732b76171120a088643888386fa3
font_02_sfnt_off00014bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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