Malicious PDF — malware analysis report

Static analysis result for SHA-256 753c1dc0f2e0f24a…

MALICIOUS

PDF

87.9 KB Created: 2021-06-26 03:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 188822b833c32c983c2f5a133d2dafc9 SHA-1: b4aed24020cfb26b262678c1bed48e43f0b9806c SHA-256: 753c1dc0f2e0f24ad3a70cfde0a843181987ad91bb937ec0379f8442f9d6bd2d
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing software, a common social engineering tactic. Numerous URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, suggesting a distribution network for malicious content. No scripts were extracted, but the overall pattern suggests the PDF is a lure to initiate a malicious download or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://irlanc.ru/uplcv?utm_term=tiny+beautiful+things+pdf+download+free
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/62524890840.pdf
    • https://evergreencans.com/userfiles/file/lulozezojodokum.pdf
    • http://wisdomtours.net/upload/file/xawatuwuwixuvesetene.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ce1f78dc6---96492108015.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/52e8362558dd300679e320995a8555b8/28930948999.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/33229b9f8cb4414f01d29d6659e96222/kezopad.pdf
    • http://abbwingslynnhaven.com/uploads/files/8282844220.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/f3da82b2c700e67ad8ec143d4c277c8a/pujesomadusugimono.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b3e4ae2ae---xefikixima.pdf
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705ecc855e4---dizadudaxamukasik.pdf
    • https://milsagliksen.org/upload/ckfinder/files/42658377155.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/hir4s0l3vjaf6n91c96abd1s17/jewipotakevitipajisosux.pdf
    • https://psychologgia.pl/Upload/file/34326414789.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/rbj3sdvd410duahtcqfcdrjd25/ratusedawisiwenubudutu.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/luci34mtlq9e98roblhe99l5gv/nagumidajotiwetaxege.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/hksdkmnu9k35bmgblg58q0ndjj/32080135275.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb7625682f---78639454308.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/7h724pk4orjn07arsbcfhsu0sp/nulosa.pdf
    • http://guides2alpes.fr/uploads/file/taxudug.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/bitovutabenokitorakilelu.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3859a4b79---fazilolasalunusuvuroxaze.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/deced80t0lq6024bohcj30a7s0/xijorulivapulegosifi.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cd64cc23f---derapov.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_off0000f399.bin
0362bf7a0f069b66318c3d9f88a497991d3b40e59543c8652f4ea4a0176a59a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF399 11180 bytes
font_01_sfnt_off00010d56.bin
7b6c4b1af39bc648d60d8f0f0f8b8988d08207faceb4b18b48890eb4697b7843		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D56 17228 bytes
font_02_sfnt_off00013a46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A46 16792 bytes

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