Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea34bcd6907565b9…

MALICIOUS

PDF

75.3 KB Created: 2021-08-26 08:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8cf5dc013f435c7fe412cc90d64c0212 SHA-1: d4b414f84b24f54d25a0be7f7baee2a7446c8436 SHA-256: ea34bcd6907565b9e5ff9860f42cff889e487b5629837898b47d66a39494d396
156 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, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised websites. The presence of numerous distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination or to leverage SEO tactics for malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • 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://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/be617db93f092383fc5b51124e0c7320/80238609367.pdf In PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/eb26e4280b6d043152e4a7b4426bb121/tibufosuxovofuwojala.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a406514b48c---44319744579.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/61571233194.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607667f26ce7e---zunavikem.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942f74cf1bd---5716095563.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610450f99fbbd---87978012074.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160877d4862f01---tamugowepitu.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/75293201919.pdfIn PDF document text
    • https://subarini.ro/mm/file/sevakalenafuwukefabot.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8b9a1cc8a---69473686951.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/bf8a9fdd6bd8c7e04985f6dd201bd900/tonobuloxis.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104676d66ce2---62153838549.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/gibexexigotali.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/rogamubirikipagejinugowom.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/36752341387.pdfIn PDF document text
    • http://inistor.com/ufiles/files/53562795710.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/35926716345.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/07/02/22264987159.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/584406266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=mr+waseem+pick+up+the+phonePDF link annotation
    • 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_off0000c320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC320 10864 bytes
SHA-256: b2479266d0d6a68d40207199124e6458b5b2ad2787355eaf938010957a9080a7
font_01_sfnt_off0000dc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC28 16768 bytes
SHA-256: c7b0cce5f641fd2b33bdb15306aa769df362bd9c82b58126b4ce2f0711e5c6fe
font_02_sfnt_off00010811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10811 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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