Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc4c1839df8df3f…

MALICIOUS

PDF

64.3 KB Created: 2021-06-23 21:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 841af1273c94ae6a62ed3ad04944de2a SHA-1: 9b2155a899cfd58fcf173959b6ce7051ff0e3856 SHA-256: 0fc4c1839df8df3f7fba8083b2386d1190fb601c6712102331bb48cfc7a4d778
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS uploads and disposable domains. The ML classifier and ClamAV also identified it as malicious, likely a phishing or malware distribution lure. No scripts were extracted, but the extensive use of external links suggests the primary function is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://infrive.ru/uplcv?utm_term=selden+catalogue+pdf PDF link annotation
    • https://ivanda-commerce.hr/userfiles/file/kuberopafarotinulaxiwe.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/vokixofisubobazevumodu.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160722b2220369---pojebojowalelenanoziku.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/43069349444.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/71565112323.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085293694b1a---15734133214.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/cdc847ccf13cebfcdf8fc0dbb94192fc/nukajifob.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1bb9c59bc---jolij.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607467b5b5a7b---gewatimokulututoxij.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/falekivegoze.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093dd526a251---56354174448.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094643376fc7---bolimisejabivafuxel.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/e4cab83ae1c6f131e09ed04701a63278/66714975423.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/jujamoxugeg.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_off0000bcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCFA 5152 bytes
SHA-256: 44b5731c8c6007a8f3dd7ff0606f8d84f0950a1963c82741a06a71f618075a2f
font_01_sfnt_off0000ce9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9E 11428 bytes
SHA-256: 3a9c5146ca833d68cac9808c8214fa44206f357f4f1a6996b09016d31618853a

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