Malicious PDF — malware analysis report

Static analysis result for SHA-256 85250cc854511338…

MALICIOUS

PDF

189.4 KB Created: 2021-06-22 10:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f40bd37f7dba1c84468a25074e19c848 SHA-1: d717b7f4eb1db7283b1d8a2814810a7009d19a1d SHA-256: 85250cc854511338f8ab5e0013cfe4c1c93a501dca0bdea19ba7fd65b34de8ca
104 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains numerous embedded URLs pointing to compromised websites and disposable hosting. The heuristics indicate it functions as a link farm, likely intended to redirect users to malicious content or for SEO manipulation. An embedded JavaScript stream was also detected, suggesting potential for further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://infrive.ru/uplcv?utm_term=numbers+lyrics+a+boogie PDF link annotation
    • http://vce34.ru/attachments/file/dobanalazezonirewezofediz.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/11452bdda6df9098782de38f1317a679/82433913730.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160820b5e06e43---pezezumikufowadebekebi.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b0d57821d---bemokarobubedit.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/89121758628.pdfIn PDF document text
    • http://wirheiraten.de/images/file/dutetusajegesagi.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/60469095081.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/2d4a583cd3e68aa066414efd222d6a7c/40963885687.pdfIn PDF document text
    • http://sushi-belovo.ru/files/51117807809.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/bulufewelaxefosasi.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d142e8f69---dogegirixusobilo.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/70vfj7d2bma3u345te9eorkjs0/pofafimaruki.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/lotosakanilake.pdfIn PDF document text
    • http://asustainable.com/global/file/29494439629.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab20e6bad7e---16604449707.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_off0002aba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ABA9 5328 bytes
SHA-256: 0cdebb2295ea40a6f79415be92c5a8b861c19e142227c9cc9cb55a790e1b9047
font_01_sfnt_off0002bdc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BDC2 13208 bytes
SHA-256: e5b4285f0551b4356c6b3af27ca33002a6726b47b6b16543a8fd5443df3c4fa7

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