Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf8ea1c11632ca9…

MALICIOUS

PDF

54.0 KB Created: 2021-09-02 21:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b65cb3997e854ac8ec60905676453058 SHA-1: 99da200d4e229e00ad8b53581ce52ff0f2162f15 SHA-256: 8bf8ea1c11632ca9c2babb0ea04682b6817b01e763fbb611e1e33379a5a522a9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which appear to be compromised WordPress installations hosting further PDF files. This suggests a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6787

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 https://ketchas.ru/uplcv?utm_term=manual+override+traduccion+espa%C3%B1ol PDF link annotation
    • https://whatproperty.ng/ckfinder/userfiles/files/debusubifojase.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac873c09f8---53250757741.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6335cd136---11898307089.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/58593371964.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/qfsuj9i0j8lp847qpmtf6svfe6/woxibazobixelikexazofu.pdfIn PDF document text
    • http://kdekdyjak.cz/data/71296562159.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609486cadf433---64190990985.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/40023305065.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/nuvelubuvofatu.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/07922d2f31e3c63af2183dbd7da3b2d7/xuxuloxupulidikazavoje.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/2a0b0ddd9738b78456f9b13790f7eaab/tedixatetuwuvowofi.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086aebdecf7a---nirepunibedikotosab.pdfIn PDF document text
    • http://fluellentrees.com/clients/58222/File/56517981082.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6438106e90---xegudipurivedesixoretobo.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/tedetutefugodedovulatafo.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b91a146c9---zutakozazujizejirotog.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e2898226fa18395b3c7ed5e6feb8ca23/11174195998.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/52743170826.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdcd8cef99---didazebalazisazefoki.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/nejapavepajeza.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/78853622378.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-8-23/20210823200043635052.pdfIn PDF document text

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