Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed0e6a0c4e3d7995…

MALICIOUS

PDF

117.8 KB Created: 2021-07-06 14:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 099f88801e6fb104ed79cbcd2b1cf4c7 SHA-1: 0f717ff83f697617116e7d3a97d0fc07b780325e SHA-256: ed0e6a0c4e3d7995d6cd60b2a9b3d19d3cb6e8c68a8d50d044c20e01ca753f1b
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO poisoning attack. The document body was unreadable, but the presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the primary goal is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://osc-pribor.ru/products_pictures/file/44246060510.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbafac94e4---79681954467.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f2bb8b06a---61753526711.pdf
    • https://contabil-fiscal.ro/mm/file/29563835178.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e185dfa58---3746071419.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dabcb7a9d---gogavibarelebupagusopipi.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/2995f7301eeb290a4a575dfb7b7315bb/95205392959.pdf
    • https://fceresources.com/ckfinder/userfiles/files/21034310277.pdf
    • https://triosms.com/userfiles/file/fifodaz.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/c19f26605b5cede7053e5f69854d1cca/vufivotetuvixuzofupadijep.pdf
    • https://apskarota.org/userfiles/file/motovodod.pdf
    • https://muratay.nl/userfiles/file/46219108764.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ff851c45134879c80e16b96a82570502/14576911620.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078940d46319---bakuwu.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/ef1894532b1b7e8f21ef35e5b44d6a8d/mezaw.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be7fb23cc48---11783777945.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6b0098fa3---75811718736.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/af35b6686699da7fa34b68be3f89ebf3/tiladakarekaxewep.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac49517f2aa---biduta.pdf
    • http://anandamsanyal.com/userfiles/file/1417405492.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d5aa7dc13---40321041261.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081c99e33dc3---wedajusowusutamiwaza.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/2d63aa1fa153875e879eb6b151c847d4/xirelimibapipibabu.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/35783bfd30cef5f9d48ff2a2896b08d7/32004757434.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=meaning+of+a+conductor
    • 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_off000166bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x166BD 16792 bytes
font_01_sfnt_off00017ecf.bin
fbb3047ccac0611959651e21ef3c267f88724c94f0235e9aa05eab6401fc8161		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17ECF 20824 bytes
font_02_sfnt_off0001b23d.bin
54371979984d4cdecb2968ad607a707713de58bdc61179bf180b1f46b61b8fff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B23D 10528 bytes

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