Malicious PDF — malware analysis report

Static analysis result for SHA-256 356553c8665d3e16…

MALICIOUS

PDF

66.4 KB Created: 2021-09-13 15:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 919f06d327634c316dffcaa2ed3b3047 SHA-1: 66617c60db3d7fa6e30431858f1e8e87a4321e47 SHA-256: 356553c8665d3e1604177980ae4eb257e9cc0254bb340216db6f1f631b8a7338
162 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external links, some pointing to compromised WordPress uploads, suggesting it's part of a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8294

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://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132efdcbdc94---dutazokapiteves.pdf In PDF document text
    • https://huaku3c.tw/uploads/files/202109082330074409.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/96471342783.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/kosixev.pdfIn PDF document text
    • https://granitnet.hu/editor_up/20796298725.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/8306767325.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/43693068754.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/56749279486.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613543cd043c7---4865272770.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/vilagonami.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/wuvevoxipeka.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/84344572648.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/5319609132.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/golebanozumavivinabuxov.pdfIn PDF document text
    • https://negaratoto.com/contents/files/wudito.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/palabopakaxeg.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/dajejigotizonebulutabekok.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/87160679659.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/sifumenofa.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/70700136764.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/46759289309.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/8hvbhdbf7gs3gajucto9au8h2m/pujizojopuvamukojumepit.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/dunimexapi.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/pebijejowagamigabejuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=playstore+cant+openPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE242 10392 bytes
SHA-256: b484efe7daf1b48978e2f00b30685243a73997831ae96defd1a8071265587826

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