Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddfe495f0c948c75…

MALICIOUS

PDF

84.0 KB Created: 2021-09-01 04:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f9953079b7a6e04791cf5f0c8fed94d1 SHA-1: f517e8cd288fbe69aece931422b1120349ee3495 SHA-256: ddfe495f0c948c75f68c2d2749d41d34d5d2244ce05d9d0525ad018a777c022d
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 an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly 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 URLs, many pointing to compromised CMS upload storage or disposable hosting, indicates a distribution network for malicious content. The document likely exploits a PDF vulnerability to execute code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://hyosungulf.com/uploads/file/molozoxudixadasoti.pdf In PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a309a7272b1---zujimosowojugexoxebine.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18ad9794ee---77042281811.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-8-12/20210812010050419620.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/67385245359.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/91420c3da6237e17d1c211ed4ba46c43/warufuvufepaguxojipe.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/visupexumobitixabivesegen.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/14210093178.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/48422631693.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/wugoxuwiteketus.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/dufimi.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608beeffa303f---82337104568.pdfIn PDF document text
    • https://avvocatoboretti.it/file/kojakuzotesi.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/61042894206.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/34639145792.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/mepokuxozasevim.pdfIn PDF document text
    • http://cba60.com/clients/6/6c/6c2dd71b6188bc8e8f5adc6209c6f86c/File/zosuzagimidosaparopewuz.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/fuguro.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/25031985663.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/42136352216.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fd744308c---26058238054.pdfIn PDF document text
    • http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/rumekuzupuzu.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16077c1d53bfe1---25962195348.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/42852327995.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba929d983c---22111245529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=convert+french+to+english+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_off0000df5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF773 10836 bytes
SHA-256: 37daa5d2cda58992ec1751b9b86effb25fa6bc961489eacf6ff8fd84d0acc2c7
font_02_sfnt_off00011033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11033 18420 bytes
SHA-256: a2165f3cece7a37ccfb5f42a4ffd993efc2cc397f3948de82b2eef1c4573fa39

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