Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bd84e6282280b45…

MALICIOUS

PDF

78.1 KB Created: 2021-08-15 10:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ade5a208610ea1d66f9493ce446c4a2d SHA-1: c3c0e92430bc4fa6bac1b7b53c791dc71157a2cc SHA-256: 0bd84e6282280b45dc846221c4bf5411df6db6b2471390891ae06248c56b6c29
156 Risk Score

Malware Insights

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

The sample is a PDF document detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lure victims to external sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://crysiq.ru/uplcv?utm_term=sous+le+ciel+de+paris+partition+piano+pdf PDF link annotation
    • https://atvatextile.com/upload/ckfinder/files/27272603855.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210708_4B9AAF87FFF8A9FB.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/be2d415fe0f01e299f1cd1cf34fa990f/wavejobutoxodedufopop.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/51217917575.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16076fc824d1d2---tegavu.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/2c1cf66d01a8294e6a0365a02d40733d/milijivibazuzoladapot.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cdcaec3e4---79000090798.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/46350528459.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/b53bddeb48f3aa9d8d7159acaa871cc7/88365014271.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/vigotasofisokozabowi.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/40426708288.pdfIn PDF document text
    • http://udclassof1968.com/clients/74076/File/76233975062.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d23dabf66---27015372359.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3701fc3fd6---72023779186.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/df25b5da8570465b41926daec16fd731/61818476829.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/nisifepeteniga.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/sejabu.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160960dd1a526b---zotomupusegokodaduwuw.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/99546552922.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/mowidosojifizijuned.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/vagilowesuxovilimojewi.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/90554091975.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/nuzuwabugerololotin.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/c8nbqejo3189pt72kb0dhm3490/81232949752.pdfIn PDF document text
    • https://5uempat.com/contents//files/23421580145.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_off0000c951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC951 17936 bytes
SHA-256: 0f8f819aa722c115bfa5a280841e41d2ed1b47bfa9dab98203467022e3ec6d7b
font_01_sfnt_off0000f789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF789 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA0 10788 bytes
SHA-256: 2c02e76693495c3f87f111b27c7cca07ae8cffadcbe27fb6e2edee533a02f644

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