Malicious PDF — malware analysis report

Static analysis result for SHA-256 16faa6a0e393cd0d…

MALICIOUS

PDF

84.4 KB Created: 2021-09-01 00:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b06ac66e6c8be34c00b7200c1a2e9939 SHA-1: 223fde86da8269a1d78dfdfccc4a4aed94914e92 SHA-256: 16faa6a0e393cd0dd980a89d1cee0703e646310a3e3393caf633d06570d62c08
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and potentially disposable domains. The presence of these links suggests an intent to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/k30e8duo64o76sh508b56q0cp1/89814670472.pdf In PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7499a0ad9---77222051859.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/40858615246.pdfIn PDF document text
    • https://atrax.hr/files/18378187228.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/64373858274.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/nopomoxurub.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa56bb66ba---zoginivapuvap.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/60359979702.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/dulivajuzilelujipudaxe.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/74323028274.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/52005cd29ca1abfe66278594389e00f8/62962358548.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/8398666b52c25a777cfc630f7fc9657c/90858714468.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/fozamis.pdfIn PDF document text
    • http://martonelektro.hu/files/file/53485266599.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/74997524206.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/togitagopeda.pdfIn PDF document text
    • https://digireg.pl/upload/25132174947.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73bab0213f---tevijoxurawemawagovaf.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/74492642389.pdfIn PDF document text
    • http://etre-belle.su/images/file/puwevifijirijefujitovi.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/e02b70400a49601353f30d0dc645f5c1/dovapurerufefixejaman.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/a4ed7e3f5127cdfadcbbb58235a1bb58/kewimijenuziron.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=features+not+to+be+tested+in+test+plan+examplePDF 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_off0000e69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69C 10872 bytes
SHA-256: 67109d07340b4087abebc2ce69a68330eed3f9ff908f6a329e26290d6ac976db
font_01_sfnt_off0000ff72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF72 17052 bytes
SHA-256: b4d7ccc09003ee9cde289cff2630189b1328aa06646c696716af7cc9ede584a1
font_02_sfnt_off00012b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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