Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3011c0aed7fa45c…

MALICIOUS

PDF

93.1 KB Created: 2021-09-05 17:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 114e981632d692e570116decc6100498 SHA-1: f6e7d4d700c00ea5fc5d68c24c7c8cd5a6b557ef SHA-256: b3011c0aed7fa45cbbbd650a29998721caf764ed06b8da7116d9138458f3c24a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or exploit vulnerabilities. Several heuristics indicate the document is part of a link farm hosted on compromised or disposable infrastructure, aiming to distribute further malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or trojan distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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
  • 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 https://coretry.ru/uplcv?utm_term=book+learning+german+pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5690ef49b---delefamorolel.pdf
    • http://meijialx.com/ckfinder/userfiles/files/duvilizusabilodowo.pdf
    • http://auto4-spb.ru/public/images/ckfinder/files/75834523235.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/fuflshdm0ilkfuhgbnjh6pehf6/24159114134.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/62740597271.pdf
    • http://accessiblevehicleservices.com/userfiles/file/14192183267.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aacb108d47---6382462174.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d47052128df---kefapenaguzaxolugizodi.pdf
    • http://www.aportecnica.com/imagenes/editor/file/bidadikugimizo.pdf
    • https://lotteppta.com/beta/assets/file/sukotalukabiboworut.pdf
    • http://blesk-stroy.ru/userfiles/files/41144165146.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160826d6d2d3de---73378646196.pdf
    • http://gunjanjain.com/app/webroot/js/uploads/files/nejuwikuwadamomegukewefaz.pdf
    • https://blokhol.com/upload/files/1806209086.pdf
    • http://www.rify.us/cms-uploads/files/35774547054.pdf
    • http://campfirewtx.org/userfiles/file/vopora.pdf
    • http://4998horo.gmmwireless.com/contents/files/kewelabafox.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160830b6e3964d---39266582183.pdf
    • http://spbmedax.ru/sites/default/files/uploads/zabapep.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607919b361bba---zemekixuvuduforokonoteru.pdf
    • http://bayernglobal.de/userVZ//file/falezomenunukon.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/601cc8ec7941e6abe0cdd3390a557df6/didewotomojazadoligu.pdf
    • http://ilovegabal.net/fckeditor/_upload/file/komig.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/8i0js965r2la8aqo92orj5hn61/10953156811.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/2089ce567b3729589cca6dd4e4408eea/1341048764.pdf
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/9093645629.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_off00010507.bin
e0ba8dec64bac211f51c3bd7ef4ae572a7233abdfc0cf72f0576a59fe7575e7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10507 18900 bytes
font_01_sfnt_off00013604.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13604 16792 bytes
font_02_sfnt_off00014e1b.bin
b798d4e0ef6e4d7d8f495c64945c879e3511b5939c85e02b2dd8008c495ee9a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E1B 10720 bytes