Malicious PDF — malware analysis report

Static analysis result for SHA-256 478987cf0ac39570…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 10:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c6ad833973be14ea1188ddde762a9728 SHA-1: e1fb449ad9441c6e024872f10e6ea211751ae9c9 SHA-256: 478987cf0ac395704605958dc4df70bdf0faca92defe406cf993ba0893736cd5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/9ac3b1ccdfd3a39c4bc6769d7c73e9d0/64804390358.pdf
    • https://alharithiforcameras.com/ckfinder/userfiles/files/nopelamupamutikasaf.pdf
    • http://halongbaycruises.org/upload/files/99964503198.pdf
    • http://osoboebludo.com/ckfinder/userfiles/files/28575504839.pdf
    • http://phantasos.org/userfiles/file/maxozeme.pdf
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/josafiro.pdf
    • http://maekuangudomthara.com/ckfinder/userfiles/files/7782512294.pdf
    • https://hmanagement.net/userfiles/file/wixulobevilaruduw.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/3c80a8b4af582c203c5a873c8e53a48b/jazedigituwalemuro.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f14979f306---kipexax.pdf
    • http://galeriejacqueselbaz.com/userfiles/file/33203421416.pdf
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/381d22020740d02d55ef150d118486f4/40622450284.pdf
    • http://akwarella.pl/user_uploads/file/suxonulimekagirevogene.pdf
    • https://salvatoredivilio.it/userfiles/file/24488498727.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/b7cb50e80d5f6b7a13d269cb9bd66785/51419277301.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c89e985262---34481925976.pdf
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/88905747340.pdf
    • http://sunrui-ti.com/d/files/72970972513.pdf
    • http://meskerjager.nl/media/files/nizower.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bc264056c98---56789439365.pdf
    • http://cestovni-postylka.eu/userfiles/file/siliv.pdf
    • http://universalthailand.com/images/uploads/ckfinder/files/13270719490.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b5070f584---18853814920.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=mycoplasma+characteristics+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_off0000db1c.bin
df1ab39c814245ff0c785f68267483a7e95c6ddc832f7c6efaab374b2993cbf4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1C 10888 bytes
font_01_sfnt_off0000f452.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF452 16792 bytes
font_02_sfnt_off00010c64.bin
2cd4c8e190897e8c97f2096bb3a02596bdfba655201fff56e56babffb8ac510c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C64 17496 bytes