Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2488d7bece5d66c…

MALICIOUS

PDF

104.0 KB Created: 2021-09-13 16:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2de18fda386aabeabfecb4407fea6e8c SHA-1: dcc5bb56e7b9148cadc29e583a63fa0a1ba76363 SHA-256: b2488d7bece5d66cae9f18f597b719d19b2e6dfda5350aa5f6b747bc579bb31f
204 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and multiple external URIs, many of which point to compromised or disposable hosting. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's content is designed to trick the user into installing a browser extension or update. The embedded JavaScript likely facilitates this lure or downloads a second-stage payload. ClamAV detection and ML classification confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • 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.
  • 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://synphabase.ch/upload/file/sodewixonogokamiza.pdf In PDF document text
    • https://membermimpi.com/contents/files/vujadipo.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/46403560263.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/siwunifakipemusilubivimi.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/labig.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/diwipovukegume.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4650ebf6f---petevizusezefonexogapubo.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/79362473677.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/fizidibidimab.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bf8e3e5e7---jomewabaxev.pdfIn PDF document text
    • http://silver1979.com/upload/file/lowere.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/dubifefijerudenodaleban.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4ddb2d4ce---52924175668.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-12/20210912053338840575.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/tajisupamobedinebabexaru.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/wulorinudalurik.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/53066175043.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/xejutubelokonuxojagasuta.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb6e8e0df7---pevijotajuzonebodaturu.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/tugudefire.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/37111201272.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/29322524268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=year+5+verbal+reasoning+pdfPDF 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_off000133a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A0 10900 bytes
SHA-256: 7b24e740066e87dc04e2e219813bafa5132023ed17f2a7479fecfdcdc0c5dc1b
font_01_sfnt_off00014c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C86 17328 bytes
SHA-256: 14091d646afbcb7bea5129963c94c7f309adcd1f8b6800800d67f8fffdc9da30
font_02_sfnt_off000179c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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