Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb48ea55f80390bc…

MALICIOUS

PDF

80.6 KB Created: 2021-09-13 14:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1f1e6bf60fea243202c9258590916b0d SHA-1: 4f107dafd689adcc97b47862e8a7a685154f4077 SHA-256: cb48ea55f80390bc14e0da2ac6a87c82c57af24ac5f29c0ff8cf16e8b6c1513c
196 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, specifically a browser extension or update installation scam, as indicated by the 'SE_BROWSER_INSTALL_LURE' heuristic. The presence of numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggests an attempt to redirect the user to malicious content or download further payloads. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation or further malicious code execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=chrome+run+apk PDF link annotation
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613e957a40c3f---43817112095.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/65063002619.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/14294585609.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/677munu60buiubv8mlqigal5e2/9976189687.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/zulike.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/mifalusut.pdfIn PDF document text
    • http://videocycling.info/files/file/76794823510.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/39393894091.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/73076440392.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613056bcd5b42---63788061404.pdfIn PDF document text
    • http://12shio5.com/contents/files/jomokoxenipivozo.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/16623489367.pdfIn PDF document text
    • http://tianfonmm.com/d/files/10462445049.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/feparudemogo.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/buxesimexelamusav.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/rigisen.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/49344647087.pdfIn PDF document text
    • http://hk-keber.de/images/file/wezafinus.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/75748577602.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/a900b557ff814b0af2d8b590eb9b40fc/surupedilidorelan.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/wofukasutazed.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/75969450465.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/3850682838.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_off0000d8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E1 10336 bytes
SHA-256: 7c36a40f2fd91f347aab828797f8a6f19824af78b6e743638bd9df6fa19c72a0
font_01_sfnt_off0000f001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF001 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10813 17696 bytes
SHA-256: 14e3b084f41f0974a3cbfef3ae7d64c7d5740222f747ac4e3388b8fe816fd828

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