Malicious PDF — malware analysis report

Static analysis result for SHA-256 8071c73c2a99327a…

MALICIOUS

PDF

97.2 KB Created: 2021-09-06 18:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: df740851a5fcafc0b71a5b9541aad600 SHA-1: 61af98383382177478a7c8fa38f1b6b4870a54d0 SHA-256: 8071c73c2a99327a6b79dfb2d9c3f7cb98d726574d6790357fe5ff4dc07a82dc
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it likely exploits vulnerabilities or serves as a phishing lure. The file contains a link farm pointing to numerous compromised WordPress sites, suggesting it is designed to redirect users to malicious content or further stages of an attack. The presence of multiple external URIs and compromised CMS upload links reinforces the phishing and redirection nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9802

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 http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d321424910f---38675274460.pdf In PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/metadezuxibubib.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/68082839639.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/lazawemefewajoribefuxikaz.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073b7f0be614---12392509183.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/cf8d67afb9cd3e51b2957dec25fb0c22/71336972555.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/80fd53d55e056a4a4a20a8be37414690/komejavapujoxa.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/86343287792.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/rixolatuzewebi.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/11197934019.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/murop.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/61499118784.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/45689073027.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf97997124---bavizutesotajafurekiki.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090dc11b9d3f---wanod.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608638c576887---vejusepa.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/mojine.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/35932809435.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/zepemit.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/ruwejididex.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/61680337531.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb564143f9---50232258646.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/1p0j29oq7sm26kodimpdqdhiru/4008610426.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1f0b7f5ca---92842543282.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/ratiworowuxujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=appointment+with+death+pdf+downloadPDF link annotation
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF268 10564 bytes
SHA-256: 66cd5ffe0a774659648971c85efbb4c20ad1fbdf51e9dcd0c80cfb1fa4eef8a3
font_01_sfnt_off00010a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A57 21032 bytes
SHA-256: fa67941d47113f5d77e0f7a4e630d120a41f904c8ce48be1794d12fb4c163806
font_02_sfnt_off00013fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000157c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157C5 1868 bytes
SHA-256: b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8
font_04_sfnt_off00016077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16077 16160 bytes
SHA-256: fa5cbea137587b1d4bb1c548ff3f8d17a18587fe273de630a8d80f12e69f99e4

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