Malicious PDF — malware analysis report

Static analysis result for SHA-256 284ec0f45a51ac5e…

MALICIOUS

PDF

87.6 KB Created: 2021-08-01 07:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d1e8e0259bde7e3dcebad83893e9107 SHA-1: 635ffecf14b305f58178f163679b920717aa88f7 SHA-256: 284ec0f45a51ac5e4c5f66674431782ab5075d1ed246357a60f213f83e32130c
156 Risk Score

Malware Insights

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

The sample is a malicious PDF detected by ClamAV and ML classifiers, indicating it's designed to exploit vulnerabilities or deliver malicious content. It contains numerous links to compromised WordPress sites, suggesting a link farm or redirection mechanism to malicious destinations. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the document is used to host links to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab940521063---livojojifusijugutir.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/8bb02b48276fe05d874d206318c7574d/nakorov.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/c1jdaek61lu93kutlh6m43tlho/71495417673.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d47d51c469---lebokirexi.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/8d1dc8570be3202eff2bfbb798e028d1/68845063907.pdf
    • http://automozg.by/upload/editor/files/lofirawolag.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f9cabfae3---morafopopokowiva.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/9fa5dcf59550517f3dc437662762e2b0/5965740103.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/875gg2vf8r41gr3enlsvl11nso/nikelawadabezo.pdf
    • http://ahcxdq.com/uploads/file/081403037051.pdf
    • http://www.northern-japan.com/image/upload/File/80316892997.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b5f7147e8---44664642331.pdf
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/kezagoxubu.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/d673c16a2c5e79c6189fe70d2bfff336/45007776391.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/68d35c003dd49b8eaedfa496d883dd04/gosunavivutegezirazitijo.pdf
    • https://nevisnews.com/userfiles/ziwapowikaru.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/dnl7nrmpltmbe1tgptqdfc1378/jusukexikakene.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ba86a66eb---sulepijomerik.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/d19c7fd13dbc1389757a5d53f821a481/poworelazexalidevoj.pdf
    • http://ambulatorioveterinariocamali.com/userfiles/files/93923050538.pdf
    • http://mdsalon.ru/img/lib/file/73952303987.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078c03d024f2---lugexo.pdf
    • http://vzwsportenmuziek.com/content_docs/22263427847.pdf
    • http://promocode.lu/userfiles/files/fiviwuvilozal.pdf
    • http://project-lovcen.me/userfiles/file/86281335648.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16083769b862c7---mekojapabexexemejawibe.pdf
    • http://danies.ru/ckfinder/userfiles/files/78720039427.pdf
    • https://nutricount.cz/UserFiles/File/68657229577.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+clean+nespresso+vertuo
    • 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_off0000f283.bin
2af53fe45396caf398909276623abbaa9c34742aad991d55aa8a499919a4b087		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF283 17208 bytes
font_01_sfnt_off00011fb0.bin
945199f1680788b1013f9323715dab3c05034961a13bfdbe44a677f046e756b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB0 10520 bytes
font_02_sfnt_off000137de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137DE 16792 bytes

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