Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d801430ad78889…

MALICIOUS

PDF

81.9 KB Created: 2021-06-19 05:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9cb7ab6f12de03ac80de049523ae11c3 SHA-1: 42221ca21a7d43b6018f13e17c059a7c345d2a8b SHA-256: b9d801430ad78889b15a05b1d0b9d6169bba6fcdf4e5cb642ab8fc4d119ad353
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the nature of the links and the detection suggest an attempt to redirect users to phishing or malware-hosting sites.

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 http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160718afba679e---kibenuv.pdf In PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06dd6c689a---tagaseselizebelanes.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/b18f03de0ed2eb8539c8f063fefe89cc/sugadirizarubine.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf57db100---84133319835.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/1mcf9bdkaoecaaha9ueqo6np26/40762267285.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de9edc665c---49025036390.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/32d23a0ef0c40b51adbd4cb651462d69/nabavuvugefowulupiveg.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/38067550997.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33016b9cee---voxagufogikinozaluba.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/zepitixaluzit.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/87021d9cc11377d320cdc3c0d07b5fa2/momutovabetijowutoralenu.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160809fdeb35ca---46318599999.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/ssd1oig4vusr8aksj4gholjdev/96473814581.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/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=lugia+pokedex+numberPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE893 7608 bytes
SHA-256: a4c82999b0c2c4fd52f981409a5e688f108249d4c464a9c3342bf6a4c5e4facc
font_01_sfnt_off00010270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10270 5280 bytes
SHA-256: a4060555cdcc2316fc1135cc5986ea908034a2ca9862e05021e0aac819c79016
font_02_sfnt_off00011457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11457 10968 bytes
SHA-256: ec1a5ab40f8dc743ce75555b4b36a67a992efc3916f094254ed2c59fd1a06fc2