Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d08764a8e7583cd…

MALICIOUS

PDF

70.3 KB Created: 2021-09-26 22:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3dd468b2cb39f49ff2a2a5c5ac557845 SHA-1: 8406c125ee3c619fe31b7a9eac527bb6e2782835 SHA-256: 6d08764a8e7583cd678d1c42d930a5cfe6328fe4e4dd90e8311df2a2f231473a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or are part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The presence of external URI heuristics and compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.physedu.in/newsite/userfiles/files/rapif.pdf In PDF document text
    • http://constantemail.com/userfiles/file/163159632114464621683.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/74664701071.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/fa65033bedbede8dfb3671c2363a087b/busejobelidofer.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/kuwivezomod.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/8192112471.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139edcd024ea---9704770207.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/19798122632.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613732c2532d6---99665544277.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/puvopujejarul.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/780bov101jqvh1nf5nh7k3jpkt/76959303594.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/bilariwevajodoxo.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/fatedepu.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/0d5849e1a99fdee14834d94ba1cca0f1/rukadodaxipegudavaxifofuv.pdfIn PDF document text
    • http://pinxedien.net/upload/files/dazuponewisimuje.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/tilozeg.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/49710283617.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/68077507840.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/nimisuporinakajorutalofa.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/rafenoweroxapat.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16134c120588f0---60767955572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=samsung+galaxy+s5+64+bit+processorPDF 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_off0000aeba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D1 11628 bytes
SHA-256: 07c8c7c0725ff87ca3f1e2be521d73cb050c9760e34e505512bd727c68289105
font_02_sfnt_off0000e253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE253 16100 bytes
SHA-256: 26a19daad4b3173914d3a318eb88557d9be4100569f2ab5b2aa6e99e251197e1

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