Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6ce467ab85d629d…

MALICIOUS

PDF

79.5 KB Created: 2021-08-20 14:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 408d3f1fcb3551dc1df114197e8afc59 SHA-1: 0fcf693bf287960ae42e2391b8bde7f384c046e6 SHA-256: e6ce467ab85d629d00824ebbf2bda77f5ab3cf22611ccc14d9e27ffe3a9aa37c
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a network of links for potentially deceptive purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crewmak.ru/uplcv?utm_term=which+country+is+not+part+of+the+triple+entente PDF link annotation
    • https://betenenergy.com/sites/default/files/file/82298227552.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160947d86d45a8---1330862348.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/xojijafo.pdfIn PDF document text
    • http://wmehoa.org/clients/d/df/dff1b85474dadb967ea0c40f6d5e37f8/File/sozeji.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bedf0c82ca6---defodapipofododidilef.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/60822470907.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160abe416ac500---47531328306.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/durowenomimokigopujaruxo.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/84798609056.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/d5add21f518d3d331c6a51ba3341ef0e/8223444579.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/wefipogiwegugita.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/bafovunerix.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/nijum.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b076e7ab9---46225733464.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/a9102fe46a9a9d8eeb36b47ddf29c7fa/memasutuje.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/ramemirunelesopad.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/joil6bqr0pj3hencoaskbp51ft/deparebuniwosezoleje.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/87b8e2mqqqjdk7o5b1ou28atu4/75044592890.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/juzesirebimezedipoba.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/keradeni.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///58622055336.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210607123721.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_off0000d4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B1 16412 bytes
SHA-256: cb8facb4067bae03c2916d2c03603d76cc037e9ed7745dd8a64dcf2e25882980
font_01_sfnt_off0000ff00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF00 10784 bytes
SHA-256: c357cb614f4abb5cf9c4d6c7a844305d16a3129771a6c5171b2c2baacd1709df
font_02_sfnt_off000117e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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