Malicious PDF — malware analysis report

Static analysis result for SHA-256 928d5e695aff25d0…

MALICIOUS

PDF

74.7 KB Created: 2021-06-24 06:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 0e5e1c964a9bdf83681fb04e7ba7cf6b SHA-1: 8260d4ca2d1a8e7dd0a8161bd9fe619c8c59f91b SHA-256: 928d5e695aff25d0fc1e6388017428c9fba6adf871c3cb4e1c8cbd2612fc50da
154 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8506

Heuristics 5

  • 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
  • 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://www.ecvbrass.ch/user/web/file/32092663433.pdf In PDF document text
    • https://kodcomputers.ro/2664/uploads/wakusumaj.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/504a34c82145c2cf649e1c3770ef0f8c/75791895479.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0abd7d4565---14373569733.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/paramegebexaritixe.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/1922757863.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/26277959647.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a09048bc7---bumeze.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/cb402063jrc9tfbbu0h41f7k03/56862748622.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/982782f02bfa2d8a1ab4848b4b49d764/ralemoxilabojurebemax.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/0b2f34a4eff8a5aed78333cf6bba711f/tulilazudabuf.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793aaf83ccf---23085477507.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/goworokalupadopisoj.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/58686407223.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d774985f47---mulurovako.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160890b33a1356---narubilamo.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/68319623170.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+brand+within+daymond+john+pdfPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EC 5216 bytes
SHA-256: 9d0daf071785fbb0cb1b9026ad854a570e1234b1525da86dc988fcf15c5a22e8
font_01_sfnt_off0000fa8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8D 11372 bytes
SHA-256: 7b2c0ba5c036ac6caee5ca7a6a886950802f568c0c1c9d5794d45ce603c5400f
font_02_sfnt_off000120ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EA 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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