Malicious PDF — malware analysis report

Static analysis result for SHA-256 315a95420aa68770…

MALICIOUS

PDF

87.4 KB Created: 2021-06-27 23:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c6d40344bcf362ff47100baa78f3180d SHA-1: dde81501fa98c7e506f7f8a3acd35ea66530b62b SHA-256: 315a95420aa687708c9f4cce30cdb7cda8b4d55de13d42d62e2e41c185404034
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous URLs that point to potentially compromised WordPress upload directories and other hosting. The primary purpose appears to be directing users to external, untrusted resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/152fea5dfb30dd2f8c4c89b3bfcf0bbe/57141974430.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38d82c764f---wipowozusapatiluj.pdf
    • http://manavpublicschool.org/manav/userfiles/file/15527962714.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b381cb87db---27850578837.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/91eb6e5383d5ded2d0ad4b0431dd9c69/84639204712.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/wezonopofizoluxepekudivu.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/7cc86eaf1473132615ff30cb704ad279/191630001.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/049229d46b08883e4a5e3fedf66c79e7/pinufomadavuxodon.pdf
    • http://reutlinger.pl/userfiles/file/bifezexowubivogi.pdf
    • https://queensflower.nl/clientfiles/nunog.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a90266f69---ruzagolatipuwit.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9bf1040dc---61221771760.pdf
    • https://aawyx.com/sites/default/imageuser/file/85309004430.pdf
    • http://dawahcity.com/userfiles/file/64476821805.pdf
    • http://buergerforum-tirol.at/file/9106789943.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/83e0e03eb192262dc3156bcf321222fb/zokapixogufekigafewepamud.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/86fb467c1419aa3e65cc04fb948271d6/31014188331.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//tagorodiraperagaxun.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/kuvefe.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//pepaxikoduda.pdf
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/7876621462.pdf
    • https://abe-rdc.com/userfiles/file/sebawolijirikelasoz.pdf
    • http://provia-events.de/pics/fotos/1/file/52967249029.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a488e813df7---gezofonotudamazulolip.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/96e8b1fde1ba92acb55d690482214ce8/96131369968.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a8bab20eb---98485899444.pdf
    • http://assistance.uz/images/shared/file/82772794193.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=make+multiple+pdf+files+into+one
    • 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_off0000eefa.bin
a0cfb4b98a5ae2ca3ad196a271265ade96e8e27814512b02ed183a267165d5f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFA 18460 bytes
font_01_sfnt_off00011f64.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F64 16792 bytes
font_02_sfnt_off0001377b.bin
370286c3f223ac4cddec72c3ef7ed9a4d40d65dff102cd2217600c78aaf98555		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1377B 10744 bytes

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