Malicious PDF — malware analysis report

Static analysis result for SHA-256 45ff1e4288d5bfeb…

MALICIOUS

PDF

73.5 KB Created: 2021-09-22 14:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d68ce643f5f3ef74af2741dc35f1d06f SHA-1: e5e346b932410bfb792d24fbea753f294101f2df SHA-256: 45ff1e4288d5bfebdb0d60efbbbfa4e896330702c18e3eafe627563ba07f64e3
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external resources, several of which point to potentially compromised WordPress sites, suggesting a link farm or phishing lure. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6968

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://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/140666c04a35dc267e3425a4c470d3bb/nawobadabaguparexirixozo.pdf In PDF document text
    • http://lejuriste.ru/files/file/80310948062.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/nexovupenowekazukugafi.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/nabaje.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/20239964021.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/61408312885.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/xaduxowituwekavusivaji.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/pavonoseviraj.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/megurugiju.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wawajiduriwudojexawimi.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6a71a0783---71459043671.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/25404558540.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/91582268139.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/98621779935.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/jorasimafapomekozesiseb.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/4240030003.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/81035933458.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613699fe4650f---vutilowibew.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/nekogajigi.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614aefa1acea0---29576548690.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/99006515542.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/38503228980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=feel+good+movies+hollywoodPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35A 10472 bytes
SHA-256: 74185aff7b82609e71edf2c1bbca8128651e7e829c7e370d95bf5140c35f5adf
font_01_sfnt_off0000eaef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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