Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84dca989bafe54c…

MALICIOUS

PDF

73.0 KB Created: 2021-06-20 23:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 8c72926989e68ab544de44ce57b5dd94 SHA-1: 1c10c0d337f0000916ad8aeaaa75d6b7d0cdbb9b SHA-256: d84dca989bafe54c6efefaef524cc73b72e5d7719c61724b7f57f511515a2fa1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs and the heuristic firings point towards a tactic of using a seemingly innocuous document to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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
  • 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 https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/uiega7uurdmo6upjj79pfm4856/78638710239.pdf In PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d9754d40a---zibol.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cecc2deff01---mirebababodaxubagipilad.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160be8a63c764f---pavidodataforiboroj.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8e862d87f---19624670799.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/11ce982f439b02d8bfb314da77bfb386/tuguwuzexugibifekuzigago.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/dcb47b4aff10fb5e3525d5b9a5a42a00/fexila.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/a04475ba9c2fc46e53f0794ecea2748d/jomifidizomekedodamoke.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/f320782789482b3dc77a14a78ef316f4/boxezituzebazogiresaji.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/rulafojovuweduj.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/93725009270.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/b23d3e99b25a2996682393bdd42aa171/mugamebinuniza.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/69385213576.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/53878694545.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pdf+to+excel+bestPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28C 4916 bytes
SHA-256: 377abab02a50a33ec220c0c715825dc1a40a1415822be652d8c5d264d4565fed
font_01_sfnt_off0000f365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF365 10740 bytes
SHA-256: 3f5ed532d7ff6467b21e10f9d6b546a6fc828b0b5ff60ee9137bf650cead3369