Malicious PDF — malware analysis report

Static analysis result for SHA-256 2df7c9b6c95b5881…

MALICIOUS

PDF

87.0 KB Created: 2021-07-16 12:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f5c0a082bdaaaaed614d3337bcda1df6 SHA-1: 68862e1705fe925982d938301eb047ab3657458c SHA-256: 2df7c9b6c95b588174df81897f48e9f99488373d306e58243d89dd87315f9a49
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document is designed to trick users into installing malicious browser extensions or updates. While no scripts were directly extracted, the presence of numerous links to potentially compromised WordPress upload directories and disposable hosting points to a distribution mechanism for further malicious content. The document's structure and embedded links align with phishing and malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a872a339e83---93716729814.pdf In PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/xudakexipejoparesuvafoje.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/ruzex.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/4803113891.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/d912e57d9d24ccf2ac60e1a662560861/janumodomibo.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/1fdf86ddbe1fa61397860345f5e37280/75201491596.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/sumopamididurikasopuxi.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/fazunapafix.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160983f0d31cbe---24611554721.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa03fdb4ea9---49445446455.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/28499039536.pdfIn PDF document text
    • http://mayamalay.com/clients/874202/File/wasibikuzelumematepotovuf.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/surabosatojamivuruvero.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/71693015527.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/81988350033.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d93d9712429---94368181465.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727732a1764---40364812408.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e6b8b7590---74294009857.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160858646f41ad---voribef.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/turotutufi.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d62fe2448---92175559065.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/kefawa.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/0c445445d7c394c5670431f684be9c53/80741757552.pdfIn PDF document text
    • https://argumentua.com/i/file/51715538550.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ad32017f4d1---tiwiwo.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ba89f641bdc---narukukeniwolotova.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/48666433039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+a+squinting+modifierPDF 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_off0000f164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF164 16980 bytes
SHA-256: cc2cd34fdb20c0a7f70cbefe3a092ff41a7f1ef13161426398535f0ae5ea78bf
font_01_sfnt_off00011dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAD 10996 bytes
SHA-256: 423a896e6f1d001a1eb2fab2d3bad9bffe90f171b40bae41e41bcbd2bd4d71db
font_02_sfnt_off0001368c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1