Malicious PDF — malware analysis report

Static analysis result for SHA-256 2928bd5ea91fad6d…

MALICIOUS

PDF

85.9 KB Created: 2021-08-14 21:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1782b385889aa79bf898244b1cecf3cd SHA-1: dc46288ed3dbfe29085de1a33c5595350d0e5c1c SHA-256: 2928bd5ea91fad6dd3dd0420d79a38644c336003cb4cac330463f032da8f4b51
154 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7286

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://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087b76f530ce---godilakud.pdf In PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54aa299ba1---65489075873.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/64012314200.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b155a71d36e---bafizugilawukeralirerele.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/54827672926.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610709586bce5---49094214670.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/nezoworowo.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160da935e4fc70---88479448018.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/56911437540.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742b7c064e2---47238769977.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/0e669de8d56e5a9574354a16c11e7b2d/45430906359.pdfIn PDF document text
    • https://media-get.com/userfiles/files/98398464272.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/kq1m6o63djq53q19v51fhrn67i/bedelegosixupigitenelegi.pdfIn PDF document text
    • https://fallsplat.se/file/78770260159.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/vkijpvbfv7e2h0db0iki0jlvvq/84360218341.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/weroziti.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/mevizepiwufujomavagovo.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce23a845a0---xomonenutajuge.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/mogivesijusizev.pdfIn PDF document text
    • https://kajariaadsevents.com/admin/uploads/file/lulutegexovog.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a5eb13870---24555084588.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/0vdv67tqeuqtage54fcvpbqr1d/38235800436.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/6654138231.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/dozexalavuwurakagimeloz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=kovboy+film+t%C3%BCrk%C3%A7e+dublajPDF 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_off000111f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F8 21312 bytes
SHA-256: 368b422505050b549ed627c250b1892a5537015397656306164887aa583bde56