Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fdfe96de615f85d…

MALICIOUS

PDF

72.5 KB Created: 2021-08-04 10:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c52e67edb0557990b592573931699dc2 SHA-1: 9961bf083562563ce151b68a15b73bca83d4e49a SHA-256: 7fdfe96de615f85d9d3d61858d0b856bfaa88b400540cb4c30778e63128781f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=rinoceronte+libro+pdf+descargar PDF link annotation
    • https://laflammerouge.ch/userfiles/files/32488514289.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/d88ad3a8de518a329f43577307c16ffd/baripunotigajufirufexo.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/20030704878.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/198a0b9ec33ca53650af012de4991a6d/karigigovojemilamola.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/3aa06b9090452e2f30aae2f25efa24bb/genozagasu.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/161096c989fc68---kevakolajevuz.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bb4e084a7---82267694800.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/a2bc0abebe65cdf08631337461056b24/baribunifimumax.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/resefopa.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/51e976c164e434196e2176f3df284fda/xuvadozonago.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/63563406690.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/xuneberonixenetoxegar.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdbd65938f---21246483946.pdfIn PDF document text
    • http://meskerjager.nl/media/files/kexudenirobexisumeket.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/66747253968.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/venume.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afe92d7f315---25779975479.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/jenejlo97i7dsl95diei2otnca/79214604839.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/87545719614.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924407cb829---84323037153.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/polunanigizexurevajiposek.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ae1ed6a62---35400595516.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/b5888d4bb083cc21ba3d4a54bab82472/fakarazeme.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/b3cdc3bccec9f6b1d9717c297c8a0d26/44275817163.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_off0000bc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9A 10980 bytes
SHA-256: ebef4f793364b8f883443e6d10b97edcbea87f234c334da608f3252946cdb7c3
font_01_sfnt_off0000d5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD8 15252 bytes
SHA-256: 7f2f2ecbe9ea62dd31012fa8f00a65005052813c0e620e12cb086c80bcbccc7f

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