Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb640b3bb51a964…

MALICIOUS

PDF

51.6 KB Created: 2021-09-12 10:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ee663a29e2f6ddfc3babf0adbe77ee13 SHA-1: 4b57e8abc7371866b1c9a95c95fa4e0e2a49cc4e SHA-256: fdb640b3bb51a96440af165acae8abe4ea8e6e4ef9c2c4a6beab330847f559b0
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate the PDF acts as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites. The embedded JavaScript likely facilitates the redirection or download of a second-stage payload, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6164

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tomei4x4.jp/js/upload/files/50698796052.pdf In PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/3728753067.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/wukakijuwurufuk.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/71446791173.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135980711f95---xavinoposi.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/fogonogodukabezebakojoso.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/le7ecsr9ar29n1c0qcnfao56tk/55671576338.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210908222628.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/larudafopi.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/wumewuxono.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/f3bdd6186784e1813c2715ddc783500c/39375930747.pdfIn PDF document text
    • http://ndt-ultratech.com/files/rikugumedobewuso.pdfIn PDF document text
    • http://pjcwyy.com/upload/file/wisepinelulaguk.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd7a3eec6d---25447807156.pdfIn PDF document text
    • http://apsons.eu/files/file/36092594562.pdfIn PDF document text
    • https://bursac.net/userfiles/file/6183692837.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/35774116556.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/pilebebavumapanoxijumo.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/wegivupavuxozosinid.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe389e3c1e---rikomenaletumifiwesiz.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/rotijazajewusikibimu.pdfIn PDF document text
    • https://iword.de/userfiles/file/mabofuragal.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/60925717573.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/40671374360.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=vista+del+mar+moviePDF link annotation

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