Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c365d4b3ceb691…

MALICIOUS

PDF

72.1 KB Created: 2021-09-12 16:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 114cbba6524eed31703c97038ba2988e SHA-1: 77aff4fd434c811afec69e80476253ffca157c94 SHA-256: 26c365d4b3ceb691f88f455ab33b46cdd0af0baf4203a4ab0fdeb6c8704b62ca
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are part of link farms hosted on potentially compromised or disposable domains. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may instruct users to open a password-protected archive, a common tactic to bypass security filters. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://medvor.ru/uplcv?utm_term=password+required+to+turn+off+phone+apk PDF link annotation
    • https://baatco.com/ckfinder/userfiles/files/8284783899.pdfIn PDF document text
    • http://splogservice.ru/content/file/sovukejateleba.pdfIn PDF document text
    • https://alohasafaris.com/files/24188544725.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/16654318801.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/41773463333.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/jisuloto.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/guwiwovotozete.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394c8a1654b---sogunojitopoz.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/2732617342.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/21337198099.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/bemedo.pdfIn PDF document text
    • https://plasy.com/uploads/file/66824444116.pdfIn PDF document text
    • https://vpmemorial.net/images/file/12064085419.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/4144274399.pdfIn PDF document text
    • http://elma1.ru/!upload/files/kotunipotesowulev.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/80528704543.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/josapakefobu.pdfIn PDF document text
    • http://iviltra.lt/images/files/zalobem.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/97515616337.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/97424796402.pdfIn PDF document text
    • http://insei.eu/userfiles/files/lumakimos.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161352de90c6b2---jinafe.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa61b841f9---61203598872.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/zewevaxubikegovetesig.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/67337855881.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/fabimekanafulaletarafise.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5829ef17e---zasejevisoz.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C8 16212 bytes
SHA-256: 77411441e80cb5f8cf9c10da3f38df0f7aa40c57f9b13a3295060f73454e8982
font_02_sfnt_off0000f976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF976 10972 bytes
SHA-256: 7030895aebe11a8ce1dc475e384e065366f11337336eb44f7cacf6353b499967

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