Malicious PDF — malware analysis report

Static analysis result for SHA-256 920b924cbb43f38e…

MALICIOUS

PDF

62.5 KB Created: 2021-06-13 00:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1121b49c7a42756bdabdf41c12126474 SHA-1: 3752f6afb7929b738397c51350f3fd4ce9c40d1f SHA-256: 920b924cbb43f38e5fdc42bac35beee2bad6bd9e9cd9b748100eaa2c2aa06ab4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious content or phishing sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9558

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://archism.ru/uplcv?utm_term=maiyar+ma+mandu+nathi+lagtu+mp3+song PDF link annotation
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb6ab18918---86446534469.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/13400929398.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864e9e3e590---nezofifogesokutupokogu.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/sidomonapukepidix.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094803eeda33---91421267166.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/74115329700.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9df3b1a5b---letupa.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/agi3l404c767vj20vjbk3eahe2/34092843927.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a391a30c885---duwuratibivutivotoxafalil.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608877eb40edc---27735786605.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fac07c9ceb---55336072931.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/9fb98d9586c67d814b79809be7e956f9/lexebilopodof.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4dd780037---wubavinajup.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/kowapenonab.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1a640a6069a7e5223221c78beed50159/mizatojikixobirazatil.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/pamovisevupanefivaze.pdfIn PDF document text
    • http://mwflower.com/upimagesfile/%5C/kirarow.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/57137291254.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/l33gcevstnf943d9qggi3v96s2/losorivuxug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.indictrans.orgIn 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_off0000d6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A9 5644 bytes
SHA-256: a3306cfe5003b020ac2980aef234e088ca5c34b8c53546a7d5e39360857c6f4b
font_01_sfnt_off0000e9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CB 5960 bytes
SHA-256: 5c50cd28fc6a02a0111f1f1d0c130f410dc8e1c389d1322bdfd4f0a1c6049760

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