Malicious PDF — malware analysis report

Static analysis result for SHA-256 843cb9db01afe45a…

MALICIOUS

PDF

84.1 KB Created: 2021-08-16 10:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e04a6fae53ad5e55a47b7f273745d987 SHA-1: beb8c0af923c812c6dd9efe5f7897db44a322038 SHA-256: 843cb9db01afe45a3607a1b957655a671586f435c98ae21b2f2b00d50d5dc4e6
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and exhibits characteristics of a social-engineering lure, specifically prompting the user to install a browser extension or update. The document contains numerous URLs, many hosted on compromised WordPress sites, which likely serve as part of a link farm or to host malicious payloads. The presence of these URLs and the lure suggest an attempt to redirect users to malicious sites for credential harvesting or malware delivery.

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://cructi.ru/uplcv?utm_term=crows+zero+2+full+movie+subtitle+indonesia+download PDF link annotation
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc76b7523fc---direpenatusesixu.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/41bc4c05cdb5c406f807b1cc73b430c2/pabaw.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/9c6clcgd7hc5n8m3j4liapu9p2/tojolubabevatopuperido.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/dejewefatipukotaxadoni.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210718_BCFF26657ED5F96A.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/raruxijulokusipuf.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/dedabb9c231a502c6c2f24ac537e86b3/31606223378.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/94472890943.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7c3d0fd6b6fd74afdd8021a17f7940bf/46361119550.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/70434155251.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df83ab17005---foxuxuwafuroxavuwebu.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/f434440b175abe63cb6569e05408491b/49273198182.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/guxofumafimo.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/483113a2b425bed20bd062699fdd9e3f/mapekofedij.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/99dac630b89d8d37244d666bf0ea1c92/27511298743.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/damuzivawozuwozurux.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/venuguvaxizupilize.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/gefojatexowotoxufedomaju.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/lovanefujisokebajepupadu.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/96045889451.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/nuzujokalajisitarogefokot.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/742063647.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160812d698b496---76888512342.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607909f2ee0f6---32578820085.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_off0000e2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B5 11116 bytes
SHA-256: 269adca35e51049d050126ead2dab0d8f9f1b0b1e39d1a50de46a9cf6a6434b1
font_01_sfnt_off0000fcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E6 17092 bytes
SHA-256: eb5703bced84ce3f5803b89cf57968086079fe9e7102aeec8a4d05556c73f153

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