Malicious PDF — malware analysis report

Static analysis result for SHA-256 4043afd259e65041…

MALICIOUS

PDF

79.0 KB Created: 2021-09-11 03:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9d052a8a3e8598755254dff602700643 SHA-1: fe7518ec23da620c82c8fd263f7d786cb900b65d SHA-256: 4043afd259e65041d4dc8df3bda8f611df5b19fa1631a8ffa5be18b10f62ec52
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised WordPress upload storage. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external sites, which are often used for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5017

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://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613076c182400---57649557790.pdf In PDF document text
    • http://tetobox-budapest.hu/uploads/files/mupesovan.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/55306293370.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/vosuzizotiwapozi.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/wegelapupetuvofawefowili.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/16918756531.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/50979675545.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/posomada.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613227428c80f---xenaxuraruse.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/56059945848.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/6984695990.pdfIn PDF document text
    • https://digireg.cz/upload/11550276071.pdfIn PDF document text
    • http://abwva.com/uploads/files/37663093023.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/kujopitowofo.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/gebusopadixefakiji.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/34270929068.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/xapedolu.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/3800643902.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/bizogofategovirilinuf.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/20a80aed891f2ecef37c3d403709e8dc/votenoneruw.pdfIn PDF document text
    • https://susta.vn/userfiles/file/47683967795.pdfIn PDF document text
    • http://ewtch.com/upload/files/kekixejaxebogigij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=film+friends+the+reunionPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5D 20944 bytes
SHA-256: e8616bd700292b5eb1779ab8943625d9f179b5623825103622308bd2a95a3d22
font_01_sfnt_off00011425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11425 10536 bytes
SHA-256: aaa81223c8393ff57c365b2d9c507a84eb5aa855c3cb2eb8e3df084b148a8811

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