Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a234d002a838e52…

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 22:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 622ed86c366fd0bc10d00c77255645d5 SHA-1: dd332a3d59ef9ba5a3852b3ec188925197d7259f SHA-256: 9a234d002a838e52d9317d5665cef7581f08f6ed09b163aee69db64cdfbc6b3b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=print+pdf+in+black+and+white+windows+10 PDF link annotation
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fd347ec1ab---6833095583.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/piwipoxafukifuroso.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210509054925.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/bbd0kihkkm84f2pr0i46e26ab3/43314567648.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/83627004025.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be7c14a1dc0---3227693974.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/607f26198da87de289396b2dbaa58f28/vulidewopudiniboja.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/84420826299.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/gusaxiziza.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/29537879546.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/23784692344.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870b815a2e4---71295456214.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/89855835921.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/6b410bcb59308ba970b47364e7408ffc/pebib.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/73009500825.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/76820749137.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/soxuvene.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210628011357.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610cd320389c2---53288931671.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/e3e5c036a6d6967af2f658d0e7c96696/80582595427.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/50386164960.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/30628297600.pdfIn PDF document text
    • http://df-2.de/images/daten/file/nekuvunoborasulorona.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608658b6d7bad---57933499778.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/zizifagem.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_off0000d859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD859 20236 bytes
SHA-256: b315699d3fe0c44651fd86513883355f7a3cc1ab6d42fb3e4ac661c6456c10f6
font_01_sfnt_off00010bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF9 11212 bytes
SHA-256: bd9f350a5065751c466587e137cb3f6afce6794be921e4ccabfdb9cff2b56992
font_02_sfnt_off00012603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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