Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f962a834674a4b…

MALICIOUS

PDF

132.8 KB Created: 2021-10-21 15:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f1248264de175579e4b4e61f52421570 SHA-1: e3ad8c52d3a05959f682645a69d1dd85ec31b629 SHA-256: 15f962a834674a4b6d84429bff4f2d886ce796c503b4643597cbf2c2ca7677d5
154 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the nature of the links and the detection indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6320

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://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/46846436112.pdf In PDF document text
    • https://bd-sokolovska.eu/userfiles/file/numogamisewizesatos.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/59157119940.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/82915223717.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/dakokugaxubejavowogosenaj.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/vulisuw.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/zikenobumezoxizujemokoto.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/gifaker.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/kadoledobidanoso.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/kivezubelebabofatonax.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/jv04quhvkcr6k6o35dhp9dq8at/14054214944.pdfIn PDF document text
    • http://miydz.com/mingyi/images/userfiles/file/69655562446.pdfIn PDF document text
    • http://moneymaker-gold.de/files/34586010277.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/81490879428.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161320d73eb40f---88492460442.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/aa57b6d4b1254840ba54d9642e518df0/73895042765.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/27739604142.pdfIn PDF document text
    • http://888chji.com/userfiles/files/xawofuvuwodenosizet.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/legavapanidonavomufuzukil.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/befirotinibefozikapi.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/66401389133.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/43555215302.pdfIn PDF document text
    • https://baptistfriends.org/media/terexol.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/tuxanixuri.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/6Zflnl449io/uplcv?utm_term=classical+music+definitionPDF link annotation

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