Malicious PDF — malware analysis report

Static analysis result for SHA-256 bed37f206a65b5b6…

MALICIOUS

PDF

71.4 KB Created: 2021-09-24 13:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0698ca582fce79e1a2d53fa960bd8eea SHA-1: e8496d38dd58d1fbb35695f2960093f8a80c68f7 SHA-256: bed37f206a65b5b6c59685eff166da17d81845238743185bb75a8677377a834e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. The primary attack vector appears to be luring users through deceptive links, likely for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://smidgel.ru/uplcv?utm_term=real+cricket+17+game+download+for+pc PDF link annotation
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614134c9a8750---zazepi.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/82831648948.pdfIn PDF document text
    • http://ux-school.ru/files/files/89005849801.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/nugixotogozalojuwekam.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f087cc0a46---78680067380.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/76718672206.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/5d8b9152a90bbbebf9a0c9103c389c68.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/34938032798.pdfIn PDF document text
    • http://cosyromania.com/media/file/53469345761.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/rulupubaxibu.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/24078326974.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/93014999548.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/mac654983ginbud3fm8uk2e52c/gisag.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/26532635333.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/73903460062.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/14859304885.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/kususefufazefel.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/sufesajekedofelipafibi.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/374f3d655c5e630def41f1a8f8efa533/38703853450.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/8164376552.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/10878130409.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/58341328377.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/24838875225.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/gidolidosuxubegoxivufunu.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/pasativozakijepejotomizu.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_off0000b277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB277 17076 bytes
SHA-256: 07ea7dbe467451b64d0662cfca49c4c9c951b59b97117fd5ed11719541903d8a
font_01_sfnt_off0000de04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61B 11120 bytes
SHA-256: 058df4a7014e6fe83cf219677581decc58654ad7c6d0b4a51cc3d77dfcdc3d3f

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