Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c819d8dc14b14e…

MALICIOUS

PDF

79.7 KB Created: 2021-06-09 07:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: cccfb8a718f11740aceb2563da0b3945 SHA-1: 476daa3e1d684fa372f2fb97f1283978e971d664 SHA-256: 71c819d8dc14b14ec1e61d60a0de43e161d57a74e26cb59d5e941f559c9dac6e
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress upload directories. These links are presented as download options for a video, suggesting a lure to download further malicious content. The ML classifier strongly indicated maliciousness, supporting the interpretation of this PDF as a malicious downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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://drafthe.ru/uplcv?utm_term=munbe+vaa+video+song+hd+1080p+download PDF link annotation
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b703342edb---putukofabobebezakaj.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/zowap.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/26626768496.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a461a2195c6---diwixujabonujuvaro.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a555af8d360---33789797385.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608f64116f319---gudixewubelixibijutar.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/64981390292.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/ac98a74f3606adaddbbe9d91330f452f/timemab.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160abd98380c79---zebosimidelabijamuzoxima.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/fewigusemetubemoput.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/sevewixiw.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6b9e8c9a3---lalose.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a79544bf712---55046383547.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ac9a890bc11ec1acbdf1392a1b609981/57652497948.pdfIn PDF document text
    • 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_off0000f9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E0 5808 bytes
SHA-256: b3c0e6129c98acb320e718d15211efa7d4954815f947609603f95d1bc10163a1
font_01_sfnt_off00010dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC6 10572 bytes
SHA-256: d95a1780a5159a2f5aa85e675b2c93e1f43fcbec55b55ce0edeb8cedcad359eb

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