Malicious PDF — malware analysis report

Static analysis result for SHA-256 102e83a980503d21…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 10:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 26806e3c8f8d580048b731efe76f120e SHA-1: 125b87288ff2498a40247bb97f8797b36664dbb9 SHA-256: 102e83a980503d2124b40374e08ab6e36dfb3f84a0fe0c106dc7ceff8fa1addc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains numerous links to external websites, many of which appear to be compromised WordPress installations. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick the user into installing a fake browser extension or update. This is a common social engineering tactic used to deliver malware or steal credentials. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://laborke.ru/uplcv?utm_term=download+translate+pdf+to+word PDF link annotation
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/a26bo3ikle79p87osev60k6l2u/feginomejelilezamad.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/fusalat.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ab82cfebc2b79893503aaa4b9f3e7af/28985426584.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160abc9d92d322---57836957754.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/43093539021.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/hi47m9a3vh8smvsrk1qrolrbo0/6262593996.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/konamix.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/jebipakogosebezakole.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609264f196c9a---16348408892.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5f83cc890---sawuziziwaberojoro.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d141baa1bd---13491057618.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/77677505303c183067289f55b3204029/nanomofodelixosit.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/rofufijewupaxikebikow.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/79698708275.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d3162ac096fd1abf5d870a8b1c1d9829/vosutasumukolovipi.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f39bfd2139---vewiwebuvuvesogotavekada.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/5360022614.pdfIn PDF document text
    • http://manu-transport.com/documents/file/75273021198.pdfIn PDF document text
    • http://setadijital.com/img/userfiles/files/25809163508.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/138d1df81844c29ff926958bb3ab234d/kedowuvegubolisifes.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_off0000dc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC26 10484 bytes
SHA-256: 8c05cb3555468fceb23b677ea6c8efbbd600a908f8e1b0fb65b4839efd7905f3
font_01_sfnt_off0000f42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3F 18036 bytes
SHA-256: c715fd49056bd7de0c51789fe58e54db41728d04ff57641f2ebd18a98ed1b3fb

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