Malicious PDF — malware analysis report

Static analysis result for SHA-256 9631c781646a6a86…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 01:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce9fe513fabbf8e22c857c5da4c6a5db SHA-1: b09336e6ba7d893df6df8927232f389675ec6dbe SHA-256: 9631c781646a6a8613f6c561f7d7a8bfe748b44a60f1d0d537cbc256d4a6a60e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ketchas.ru/uplcv?utm_term=photo+slideshow+wallpaper+android
    • http://technology-mp.it/userfiles/files/losesugiwiwi.pdf
    • http://bluecreator.biz/ckfinder/userfiles/files/13349519533.pdf
    • http://everestlodgelukla.com/userfiles/file/11387543373.pdf
    • http://suurelepa.ee/data/file/83785012527.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/fe8a32276a30401157676596ef7c4156/lezezabagepe.pdf
    • https://canoe.ro/Extras/ckfinder/userfiles/files/gidivipe.pdf
    • http://marktoby.com/akram/know_news/admin/userfiles/file/3239841624.pdf
    • http://www.jindatunnel.com/up_files/file/gejefig.pdf
    • https://learn-atdi.com/uploads/files/kulijofujagakufa.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132944e6ed3a---namaxufitoxutevigeva.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161410f23e4b8c---kinodalodaki.pdf
    • http://meteoratourismactivities.com/files/files/towogud.pdf
    • http://luxcottage.ru/stroykamen/userfiles/file/rukumazij.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/348f6f332cab51654c5a4cf3d0d397a3/motavo.pdf
    • http://bagiez.com/userfiles/file/2076729085.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614031756325c---31531460293.pdf
    • http://360global.ca/userfiles/file/notubafalulumitisus.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/1mquhnsci4b1upsuo0esoguqj3/83202872317.pdf
    • https://xn--80aggmy8c6c.net/UserFiles/File/60315570862.pdf
    • https://hotararicedo.ro/files/files/80434260935.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_off0000aeb6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB6 16792 bytes
font_01_sfnt_off0000c6cd.bin
b7f079729a1d2fbae394107bab306967634885ef7e69daf52e39c55e5b085aa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CD 10576 bytes
font_02_sfnt_off0000def7.bin
5d10c0c159ae22e6b42d51612c8f246c4bb4810ba518c4fdca48e59e03383565		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF7 16760 bytes

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