Malicious PDF — malware analysis report

Static analysis result for SHA-256 98da939dc213567e…

MALICIOUS

PDF

86.4 KB Created: 2021-06-27 18:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33b344c320b4006873f8640a70928feb SHA-1: 7cae36969fa80c82c68bf314a1113950b627c8d1 SHA-256: 98da939dc213567e93705c7a61d7f9a124a298c60d904d274c0896d031350da7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. The file's structure and numerous links suggest it's designed to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/57fcb78320fcae8dc7294fd07138175e/69674335352.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/0068637ce5a7546ca8510163ac7ca9e7/xotuwizukof.pdf
    • http://proxima-design.cz/files/file/dinasademurolalu.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/p3k61o180cfh2gdgn4baokn7d9/surodonidufudejozu.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/cg1vf33ab6n3ofulcitvh09663/setewuli.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756f55893e8---1666587333.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6a29c5a20---gigunirowadukofijiro.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b01a24fb---jexowenoragetokedukilinu.pdf
    • http://70sromans.com/clients/871711/File/pigowamupu.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ec992f0d8---sujibokeminewupeto.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a9afc7d01---wologomagisor.pdf
    • https://sabagdasarov.ru/upload/file/dekibavoxadalisudedur.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c86335706b5---42949145822.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aebb76628---42751679218.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704d1a93306---nesufodejide.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbfae71a25---41170515908.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7cff5e472---xifadajuvolazovu.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/c8kj82vnant28rib0b8q51tp3t/lowinebimugapu.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/31f88cc924b591626c16297d695541af/sozezigi.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/k9ttpfh1g5lt595jk6ect52u89/fibazugotazepewileromupa.pdf
    • https://baobihungphu.com/media/ftp/file/37490709609.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/3hqjdkpsc70njsgu8g8nac9nig/47127496538.pdf
    • http://msinziniering.com/userfiles/file/gukimev.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/921a5b4049fe8750d9c33d6c72862026/45118966726.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=blurry+vision+from+screens
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f065.bin
5502fc03e4bd36bb61de7b4dc49021297ce11ca84be5e372941983bfa743bb68		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 16844 bytes
font_01_sfnt_off00011c58.bin
80c7933598c42ba49b27d7e5e8f8d21187f523b43185b0cd320574693ba00730		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C58 10572 bytes
font_02_sfnt_off00013485.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13485 16792 bytes

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