Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f96dfd7c65387a…

MALICIOUS

PDF

81.5 KB Created: 2021-06-09 19:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8f4bffa15fc1f1fb993e6c5eda328241 SHA-1: e372ea51b037dfb9f5816c4195f3912701b7b9da SHA-256: 84f96dfd7c65387aeca1d3dd9c74a6c2533c149402c1718b5a52cef8124de01f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The document body, though heavily obfuscated, appears to be a lure related to search terms, suggesting a phishing or scam attempt. The ML classifier strongly indicated maliciousness, and the presence of multiple external links points towards a campaign to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://crysiq.ru/uplcv?utm_term=who+is+the+richest+man+on+earth+2020 PDF link annotation
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/a8fdfea56b7ff68b776dd4fa0d0e416f/77320352073.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ba578a7f4---20885930558.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/waxenorizuje.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/tesonejojo.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160bfebeb46dd1---nuxekatikoronikixufenoda.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/5eecdf82e8f3d9df5fc68da5de164e70/61863192390.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/navegubetabojidajotamudo.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/92705240650.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/6ca7fe2179a6f67ce4becea6bd6445cd/kimuvaxizuxesufafowuxo.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abc0f438ecd---xosapaxudegubenima.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1a15cb504---nojudiporukixidi.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607346cdb02f5---99308356876.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef8c90bab7---bafuf.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/wikiw.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/4fc63f58fb92d0a104a4c2501f3dba0b/21637943747.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821a1db6757---dadokopob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFC 5296 bytes
SHA-256: a295909801d972d65744cf278968d4ee13c1c56c8e3f4903f5353caf30bac4c1
font_01_sfnt_off000111d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D9 11324 bytes
SHA-256: b5bc1e78f1346f48d37575756bf82cc3e85c17a975e01b24a1a2adaad1016dbf