Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81cdf19bcdce92c…

MALICIOUS

PDF

84.8 KB Created: 2021-07-16 18:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6dfe27132b9210d89716bb53daa9ad89 SHA-1: fc13e92af8ef19dbb114e5ad299bfde376e94df2 SHA-256: f81cdf19bcdce92c3bfaea29b396e8746919920ef9432cd04e5ffc8cbb32583d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to various domains, many of which appear to be compromised WordPress sites. The embedded URLs and the nature of the link farm suggest an attempt to redirect users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://beiks.info/public/file/26424730415.pdf In PDF document text
    • http://smartwealthhk.com/userfiles/jovogeg.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/87725355751.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf3d893705---82222899297.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2b5c6f0f6---ninanoxu.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0db6f953bf---24911519067.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dc51f6506c6---binowolefezibutun.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa88c5a14f---gevomekegalinuzikanotiwol.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8eddc1732---panimejusopulo.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/kurilo.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/rudatewi.pdfIn PDF document text
    • http://arslanemlak.com/E/file/51907143693.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/6a8704c96b92ae9e595197da8d1bbc56/novuke.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///44098897523.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/fafub.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/7213808203.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5003fc8f6b---73211886049.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dead2ddba34---78222674281.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160790bd72b003---kefifokoxebidejixevowe.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/903296f6b40c6d7dea28cba01cbc9cf4/55980129747.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=android+1+fts+19PDF 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_off0000ecaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAA 16496 bytes
SHA-256: 8c863ea7e16b70276ba5b60191d365dd7fe82c1d89a0804420d530129c118a93
font_01_sfnt_off0001172a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172A 10208 bytes
SHA-256: f9c77525dc61d13158bea8c4569783ac5ee8497a0f7369e36c7337b20856524b
font_02_sfnt_off00012e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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