Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f1a4a6de19a074…

MALICIOUS

PDF

85.3 KB Created: 2021-07-22 19:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6c01dac64d99db72dac5ff62545fa3a2 SHA-1: 498b2e918225a00f8b15fb74ebc85c9c23f856a0 SHA-256: 52f1a4a6de19a074ebf429c8d2517bc73be8c96aef35682fc570c6c1e0c83d2c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://galluccifaibano.com/userfiles/file/vijofakivizok.pdf In PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/463ab4e49fec4f58079b4b28e2ee6816/15967607083.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f54aed92b2---kulitilag.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/54516920129.pdfIn PDF document text
    • http://rahway1968.com/clients/5/53/53e48f2724afc57738bbbcfbfdbdad27/File/87628824139.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/01f9c01dcb18474a592bf9d73def8b04/tiwotibivuzeki.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/6cfe0b88899dd9731df7cc601058c25d/70681158982.pdfIn PDF document text
    • https://lukili.ch/UserFiles/files/taluvijumoweviwu.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85e6eab75a---27307414990.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/i1ihil71p7k0f5eagh2g8ongv3/liwemijurawuve.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/51e358dc7af8d5dc6c84c4d2a38266c3/banegepepe.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091ef5ad8989---30373865395.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c49334e0c---27312170563.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/guxesutulowanoduma.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/navowafubexorafiniwar.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/lelojavasef.pdfIn PDF document text
    • https://dvg.asia/ckfinder/uploadfiles/files/jezofigepodavalanujumuros.pdfIn PDF document text
    • http://praguetransfer.com/files/file/duxubajavimipizinidilixo.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8b75e6aec---38582565925.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/56be9313fc9b37a01471e12186b6aed4/51935334434.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cad043e06---87222479531.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/r8d2agn3snrjibpb71hk3emif6/rexagorubotuv.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/22557508952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=collimation+of+laserPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E2 16572 bytes
SHA-256: 57162cc1b63c7554e6a1adda860aba8bc44965c548b98d5d84ff3c258b240419
font_02_sfnt_off0001300e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300E 10408 bytes
SHA-256: 4555aed158acb520ca14748862c4ad57daca26d60e43cda6577087147d1129e1

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