Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd44ddb73d57e191…

MALICIOUS

PDF

85.9 KB Created: 2021-08-11 11:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4bc2416c05d0c9ab589806eceb76527b SHA-1: f479146bdf62e7d4ad4c8dee4a80383e09a3c729 SHA-256: fd44ddb73d57e1917501a5a5166f2550ad8c0a34c802fc3e4bbff18a75348c54
156 Risk Score

Malware Insights

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

The PDF contains numerous links to various domains, many of which are identified as link farms on disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farm heuristics points towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=super+mario+bros+3+game+free+download+full+version+for+pc PDF link annotation
    • http://kingalbertltd.com/uploadedfiles/file/kufanevowodejaxetimuni.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/62984491949.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/mapokenirikesamadalitiba.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/bonaniwefawiborosirazemup.pdfIn PDF document text
    • http://abpaluso.com/upload/file/99296933631.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d49fb9826---vebuvosogupux.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/sajunogutarofafezasaniw.pdfIn PDF document text
    • https://ecoretras.com/file/66693197564.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/13512509113.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/83884448447.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/37547200455.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/8mfd6dnh3iclkpnh1q1hs38hju/70752613145.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/87658322920.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/wajowujejidav.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/ac643249325047a00db99c282f007690/jupitegapizusadaz.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161105096a68a8---74116761879.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/bumixizowamofowidiw.pdfIn PDF document text
    • http://unityproductions.com/upload/files/53433665619.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607813a934a15---7488838796.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098f480d7b66---43276237411.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7dfefed1bc---29796081116.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/5482604988.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160ab58bbd981b---13258023074.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/mutarejuvepitozezoxiwid.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_off0000ea0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001021e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021E 17192 bytes
SHA-256: 78c4760dbb5762ac59efff93b6ca278e8d0fccab13cb92d65fef746a13910a47
font_02_sfnt_off00012f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F13 11504 bytes
SHA-256: 3177fa38c705053cfa82a51a8e55330c5f00084d189d7dd645a33fbce5b5e9d3

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