Malicious PDF — malware analysis report

Static analysis result for SHA-256 20dac506c1314cb4…

MALICIOUS

PDF

93.3 KB Created: 2021-09-05 14:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eac5bb43fb605981fc7dc4402bd22cb5 SHA-1: 4caf7f4b247f611523078bb87781ed373227c68d SHA-256: 20dac506c1314cb4b9c30479577a3a0d33ce0fa548b936543fbff3c8f230c088
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The file contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://stalmont.eu/userfiles/file/63184387194.pdf In PDF document text
    • http://libertyquad72.fr/userfiles/file/95965653024.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/nddsejilgc66b85n3g3qf97l10/nivatefufawu.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/0ff68d90512ed6a7750c2e92ef890df6/luwadidiremonob.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/84556186911.pdfIn PDF document text
    • http://mousike.it/img_ins/files/41840966721.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/d15odqg3bf5bugali908kp0l91/20628214527.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/39690719839.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/sisepeziwepujaju.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/xazogi.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/xefizupamewonimugugatapus.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d76842b624---83266519141.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b1f00f059---wijexu.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095e4ca50fd8---tasedik.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/nigagikamutajixasexiduva.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wevituloduzowabagebit.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/fufofekigefepugimugugob.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c333935bb0---butaxafadoviw.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/paripabisoxopuwiwa.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/46432737893.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/baxiguwavudenegutanuvivu.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16107600cbafc7---vosuwujidepigenor.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/19662021952.pdfIn PDF document text
    • http://wamer.org/userfiles/file/76280437501.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/7033827033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=difference+between+material+and+non+material+culture+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_off000106a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A0 18528 bytes
SHA-256: 5b68be579a3bc0d93bc2f938f05bdf626eadcdb290ff16a4dd9ac3508abf5984
font_01_sfnt_off00013627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13627 10940 bytes
SHA-256: 487b3a7ab29824ce6da0345f48b363835a9733ecdfd1cbdb2c85cee5a8f40bec
font_02_sfnt_off00014f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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