Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de68f3b78413d17…

MALICIOUS

PDF

108.3 KB Created: 2021-08-08 20:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4db55baaf500fb63011ac8f60d705f8b SHA-1: 83cbd1807ea8c9e318db20db5b3dd4b39b1db888 SHA-256: 5de68f3b78413d17177d1c538037ada3fb17cd8fec4c7af141429cfa238cd9f0
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content. The presence of a link farm on disposable hosting further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://strap.sk/uploads/file/91951794358.pdf In PDF document text
    • http://wienbildarchiv.com/upload_files/files/14372917519.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a913483e51e---wunubelifipogedafubenudib.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5e8da8f25---1109271021.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/danenobefula.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/gojixine.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/13065534296.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/49748665544.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/65130732732.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f2bc812cb---62095350872.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/zobususisosidafubutir.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c94f11c3feb---91310382883.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/03b4a771bb3bf2df34acdda4ad81a2a2/wakuzodigamef.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ca6a43792---zepabo.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/f85c8f0f03c970324420cfcfbc5c62f4/kiwusiwu.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/8694020660.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/buvasovolune.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608920859b39a---bewirapamawimid.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021881557251020.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6f5f965f8---woluwaz.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/fawuronupanavepinigelixu.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/mogovobediveferatazera.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/gejinudumugatotenot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=cartomancy+card+meaningsPDF 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_off0001451d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1451D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D2F 17244 bytes
SHA-256: 4499dbba531d436f81af6faea87ef32897efbc8d8a70b6ead3ecdfb9ae0491d6
font_02_sfnt_off00018a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A6C 10812 bytes
SHA-256: 59d10fccaa6457f2ae616385137dff9ded0aa570df8b257e6dd0694b216ff7a8

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