Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de7792ac311cb71…

MALICIOUS

PDF

196.2 KB Created: 2021-08-08 04:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7936a7aa1b3664011e52d43df97d4f11 SHA-1: 261630c4b7c50cbd8305fa6078f7993e0927c3b6 SHA-256: 4de7792ac311cb7187de7179d02c6e27fbbf35481455c4fb600a3533efe31f65
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a link farm pointing to compromised WordPress upload storage suggests it's designed to redirect users to malicious content, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure and embedded URLs are sufficient indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e172b226c0---85551828480.pdf In PDF document text
    • http://busankid.com/webfiles/board/file///9853777144.pdfIn PDF document text
    • http://robbes.nl/media/files/51269667741.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210807015757.pdfIn PDF document text
    • http://gyorszol.hu/userfiles/file/zusuwekegumorusosazivu.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607933aa23040---dofefetigadobusemetafiva.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3d2b0ac20---wogevalopo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6ca136c94---25168314705.pdfIn PDF document text
    • http://sivam.pl/files/file/luxijuvadeponukemep.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/88587187860.pdfIn PDF document text
    • https://ikansambel.com/contents//files/guvoju.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef8fa73956---punisomezedekewatinaj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b9a5a1eac---vufitomadilurunibego.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/boraloludu.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/c0vq8at6u21006q03gd3egjomb/luwudobereganufeba.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160867acaf0798---pemisukezemufaxinomo.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/sixakekowo.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d20479b4c3---sevawasetove.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/jadewogukorawovufi.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9ef52a004---bedilovigixedenopudi.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161007a9b9aeef---77765677329.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/27976201896.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/79603384535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=who+is+the+hindu+god+of+destructionPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00028941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28941 23628 bytes
SHA-256: 23f06b8c697b30a2c75b94c9be2406defa1316290d91adba50dde07ef7c2da1c
font_01_sfnt_off0002c1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C1FE 10640 bytes
SHA-256: 74c957382eec5b6d3815f9afd05c0fc58d5f7fa16fd972dd6ed7e85ea1d2b4d1
font_02_sfnt_off0002da23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DA23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0002f230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F230 3716 bytes
SHA-256: 30c2cf43cce5d8b2f607585e434633f3480fe9960f4135ec10d2f46f338a2e6d

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