Malicious PDF — malware analysis report

Static analysis result for SHA-256 7833536aae25933b…

MALICIOUS

PDF

148.8 KB Created: 2021-08-04 05:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d1ae25163de0246f5ed9dbaacb610e01 SHA-1: 0e3c98d468ff97968e387e30592d7267ff1a7bba SHA-256: 7833536aae25933b08f031e936e9f30c55d28cbe98c447155f0b32f6ae7cb088
196 Risk Score

Malware Insights

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

This PDF document employs a social engineering lure, instructing the user to install a browser extension or update, a common tactic for credential theft or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs suggest the document is part of a link farm designed to redirect users to potentially compromised websites or malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://infrive.ru/uplcv?utm_term=download+game+battlefield+1943+pc PDF link annotation
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f7e6feb62cc93f2864f03a0129a63944/89024258808.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61d5b9efd6---83737520270.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/73931f2d70fc1a5fbf828c750d41a5b2/50526758007.pdfIn PDF document text
    • http://chinahongji.com/d/files/99678732499.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a2a6cfb0a86ea327c902d968db710172/tinadikogepajigolutak.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/aa27494f11b4408467cfd522ed5fbaca/gibanimijud.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/wijuvitede.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/c3a0ba5a384a67cc32384fbb54cb0481/lojujukodofaxobisenolazu.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d35959d251---57784590862.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160962233ae23a---kawoge.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/822f2369630b28b1e4b6ce5fabe14965.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210630_183656.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/fuwedaxoxeroja.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f5cd2998333---wunapez.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/bb0d84cf5b7d69182802c5b91acb2260/34811976978.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4c301a3f2e7e4ed3e9fe1685638454ec/bivafikoret.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/47933967813.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/117749744008e164070b5baf916aa860/nerapebakav.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/zujebakegod.pdfIn PDF document text
    • http://burnettefamilyreunion2021.com/clients/867108/File/73063530244.pdfIn PDF document text
    • https://avela.md/userfiles/file/wubosapovolotowejil.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608858db04c29---jekasurawonijubenigumasek.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/16439702486.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b0531f4ccf55404dd1971b0b211bd5bd/69078623414.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/pitibuve.pdfIn PDF document text
    • 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_off0001df65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001f77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F77C 11392 bytes
SHA-256: ba4dda4d42ab6c43a284f34387a4c24af2261fe8cffc2d99a15230ddf7794fe8
font_02_sfnt_off00021209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21209 19952 bytes
SHA-256: e911c5907d22df6d1b283a6e4370cbf86752164b4919f523dfe6aa9a5266418d

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