Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f581e56d062aa8…

MALICIOUS

PDF

77.2 KB Created: 2021-09-18 22:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 98eb123b17dff99c4fec6b711175f8dd SHA-1: fca630d44df331dd9ea439856b79beb50af17d31 SHA-256: f2f581e56d062aa83e950fa94f8ebe5272126c343a4f88aad939693f61596101
196 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a browser extension installation lure. It contains numerous links to external PDF files hosted on various domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the overall structure indicate an attempt to direct the user to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://catamma.ru/uplcv?utm_term=anime+tambayan+apk PDF link annotation
    • https://uleshuzatabc.hu/files/file/bilujepezajopazupa.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/konabilujo.pdfIn PDF document text
    • https://migger.dk/userimages/file/jixud.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/10112903840.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/80426312472.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/58905951053.pdfIn PDF document text
    • http://espwireless.net/uploads/file/61552141081.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f60b9e16b---dojawumoladogasop.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/telozowigobijexotab.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/40839663503.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/siwamojamepusaw.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/8ce278ef823fa6fcb80b700de163b612/bemidese.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/gativa.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/6161093974.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecd9eee21e---vilosexisebubi.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/48168065094.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/giwadilimozuvipen.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613daca47cb96---45406865270.pdfIn PDF document text
    • http://snft.ro/media/file/15740302025.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/vifawu.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/30786195637.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/wuvanomorezuj.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/16087452202.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_off0000cc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC00 10304 bytes
SHA-256: a09920f6c7e05cd6f1c12e495b33c483449f2c8f7042e93a79424141cc7482ed
font_01_sfnt_off0000e308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE308 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1A 17216 bytes
SHA-256: ae9aa791cd273ef251ee77c15bddb66928f662db046e3267f402caaf6e6337f8

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