Malicious PDF — malware analysis report

Static analysis result for SHA-256 528b476cc4f1e646…

MALICIOUS

PDF

63.5 KB Created: 2021-08-01 17:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e1b81f9da51f06bc8db4d82ff6349314 SHA-1: a6d6d939ec9ee66b147e45f0c00b320afbb20e1f SHA-256: 528b476cc4f1e6464549ee6d318988560cc3a5ee962cfa5fc8c9df6c48611bed
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a likely attempt to redirect users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7964

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://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/629e55ce60d466896f576145b6e1a828/notefima.pdf In PDF document text
    • http://tetraeng.it/userfiles/files/60954022987.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/1r2jm498rf6rvh15dne7ras38o/72346288152.pdfIn PDF document text
    • http://bamila.vn/luutru/files/defofuxeviwosev.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/hcj5ogvape91a0k0opf4qj0b05/76221754625.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/zupadorisew.pdfIn PDF document text
    • http://novichiha.ru/pic/file/78339432241.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/bonoxenibojag.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/42793461180.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/4b52724f0b22d98bddac7e97d6775726/91441416523.pdfIn PDF document text
    • http://alkanboya.com/files/file///1923138358.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/99697409469.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b60fd7f42---30913286640.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/slog6oke0bf497cd618hka0r9u/39980872812.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/fakisizopisawebipanumu.pdfIn PDF document text
    • http://dsagco.com/Upload/file/11424549261.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/328295925d3f1b04d43a114f288e6568/nixofonawetogizabapu.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b4ee24604dd3ad5cfeb3b6aa62b69ea6/9799185975.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079c300b2c7c---dasepotijelivexemonowa.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c23b1b61399---fewatunapevi.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/bepoluxiselevo.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609457b38693e---javegurij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=finding+the+perimeter+of+a+square+worksheetPDF 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_off0000de67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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