Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ee9a687d40a4096…

MALICIOUS

PDF

101.6 KB Created: 2021-06-18 23:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c5bfc6d17adad0e2d98ca9cdbc1009b6 SHA-1: 15914805e8ea17fec345696e93f928636e5fb016 SHA-256: 9ee9a687d40a4096c7e589b0d8b2c8963eb96d4bda82d75776faaad9421e053a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/9ec8ce55495f6913176a8fbbeaa33607/moxifik.pdf In PDF document text
    • https://atcotourismtravel.com/userfiles/file/71912602337.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/c124436c920d7d9ec0e24e53cf176a67/tupevurobilefufetajad.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfe69599eb---748154675.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba4266f5a7---55152991689.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a0203e156---gabut.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2f1f65cbf---pejemevunufedolonosazupo.pdfIn PDF document text
    • https://alutat.com/data/file/pogoxobiziwarop.pdfIn PDF document text
    • http://schokobrunnen.com/idata/57064550866.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/hec2qdg9i7l44idmfqkc5mo442/21578639832.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/ruvukeposofotoz.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5e4175b22---98034718622.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/3a2593f589158e2dda0aa27064eb5ada/lugodokawuvibo.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607ba245800ab---98063679321.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/31f8837106cdce398da4258733344318/15148399578.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf198a58f0---pivakonuzoreb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=download+lagu+seventeen+sumpah+ku+mencintaimu+stafabandPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13144 5828 bytes
SHA-256: daa0dae086bdc62be6fe3a5df1e03cd32668b3592e5667dbb31b977772f77a94
font_01_sfnt_off00014511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14511 1712 bytes
SHA-256: 3f0828ce8539d6704c3c5c487418eae6389b94b93c39031e834bee5c0f95218b
font_02_sfnt_off00014d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D95 10992 bytes
SHA-256: 6110fd1c778089c3d45d5f5e7d76054ea7afc9467c9b0d05c2acd23ca53417a2
font_03_sfnt_off00017342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17342 16144 bytes
SHA-256: f0a8b786da721c7415a59d91fbce3b20bbb98ea32e48857ac1ff22d53b00ec29