Malicious PDF — malware analysis report

Static analysis result for SHA-256 93e095ec3c6fc067…

MALICIOUS

PDF

75.5 KB Created: 2021-07-02 10:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9139a7b10b288f2dad364cbb9bab7ccb SHA-1: 8fb0533b1a1af1473dca51382975e4e38cb5b38b SHA-256: 93e095ec3c6fc067e0b12ad809972b1925155ffcc81917081e26072c7d047350
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The presence of these links, combined with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, indicates a likely attempt to direct users to malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=net+ionic+equations+worksheet+with+answers
    • https://progin.ch/ckfinder/userfiles/files/fagavelujitujenonari.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/64a6a915e573248343b87a62713798a6/18965289363.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf103e445f---muboxumup.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16071a9fc89491---roxulopedoduz.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/4bnt33884fmcllrvo4v2bvo93d/25977928759.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/tvqs9f65b4qclfo6c7dd0tg6d0/deladezifemoxaxutile.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/ptptj12qhhgvvsqu9c9g6utr7f/folobanexajafurufesemu.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160722276b653f---25077128777.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/eeb08c36fdb8fcd7708ec69f0ccae97b/78767763262.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/b4a781c4f3fd07e66ae6aae56606980c/tetol.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b475b496916---97794889892.pdf
    • http://amadpich.com/userfiles/file/mikodabozi.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/8a6d80a3fa837327ed713117846633d3/mifidonenajixosibufiravit.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/be35512b31eb804c67d23f3ebbfa7187/77671778080.pdf
    • http://aodaibooking.com/FileData/ckfinder/files/20210606_D848AC0F02DE102C.pdf
    • http://beepost.vn/upload/userfiles/files/bovotezapu.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e7252028f---fitoxu.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/cnknq2qfjk9c1oklg3i5uate3a/52573631194.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/8mntprqvpsia66pkimci2c86da/pojeduwupejer.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25bbb8a688---18900750559.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/97073987267.pdf
    • http://digemnd.com/UserFiles/file/92868652844.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf743ea997---xefawisoxilodefaxo.pdf
    • 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_off0000c610.bin
c4201050866760e5b30d8595b54a0f52a725d0068ed88c665c71001943e5cf46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC610 16244 bytes
font_01_sfnt_off0000f025.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF025 16792 bytes
font_02_sfnt_off0001083c.bin
eee36570a0ef140904132d4db26aa7f860402c19043de604d66bc5350324f85e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1083C 10680 bytes

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