Malicious PDF — malware analysis report

Static analysis result for SHA-256 20cd7d4c5f701087…

MALICIOUS

PDF

77.3 KB Created: 2021-06-30 01:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 48321256345cd32cc2e5f1f2b91d87c8 SHA-1: 79a3dc1ec2022ed087e3c725518e0021a1ee4352 SHA-256: 20cd7d4c5f701087121fe197dd6fa58105d1ae6e5e1465334aa06b377add69f8
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised or disposable domains, a common tactic for distributing phishing content or malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The file's structure suggests it's designed to lure users into clicking these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8595

Heuristics 5

  • 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
  • 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://abugfreemind.com/userfiles/file/venugabesudebogab.pdf In PDF document text
    • http://cgl.lu/userfiles/files/28967922932.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/65226079704.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/361bf0a34c50a49260ae645bcb970d2a/74502801479.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d049ac6845b020b360a15a552672b40d/fesodabelixunom.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/20902343273.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8b5d06969---jedobagin.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5433437cb---pokuwepuvunuxirosagadabin.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/dbb6f570d53d0f4d515b2a315616a5f1/zorejeli.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078e4d1af879---52163354145.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/58274871456.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/8937c8a559ad1687e8ede50503696cbb/miwulimego.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/18017872466.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/mqn5f0kb4fu27637n0crq3o0vl/49458323227.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82e72810a---vosijirovivizosepiti.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/o7b4cep8h7k7u80pjolljlj774/50906888777.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/34641123803.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bf04e301bc6---24835174299.pdfIn PDF document text
    • http://limoride.net/gallery/file/95768322965.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/mazolitus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=login+credentials+meaningPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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