Malicious PDF — malware analysis report

Static analysis result for SHA-256 d26e826aea4f27db…

MALICIOUS

PDF

76.6 KB Created: 2021-09-08 21:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 00ac36d32c96fd3c87c3a9bc62eab39f SHA-1: 10616843401aef04ecee45ab6026d94729625eeb SHA-256: d26e826aea4f27dbd5a70a268f2e523955db24591908c1d2667a371245968ee5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting it is part of a link farm designed to distribute malicious content or redirect users to phishing pages. The presence of these links and the detection scores strongly suggest an attack pattern involving the exploitation of public-facing applications to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161323e27b9310---misuxubovusiti.pdf In PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/lesakakugolisitamig.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134775dbc4cf---gusajusifojobor.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/0e898aafc0d665770e5ac6f4eb0b584a/12631186563.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87007351106.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/8q67h2kaq3tpc65jphueoft1ga/vegubed.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/nokijenapipafelo.pdfIn PDF document text
    • http://soc-in.com/data/media/files/49977632947.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/fepekasepipin.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/vupipixomikuxotite.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/78554862088.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/monujoxufedomixen.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/dijesukib.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/15369999970.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/71144317834.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/rujanisoxetijubapewu.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/89075135548.pdfIn PDF document text
    • http://rinsacars.com/files/others/kovuberitinezag.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/digorav.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/jekogovapes.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/12746520738.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/d2df4bc9a9c6a3fafa42dd5cb23c543b/vumanamafudomizerir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=kvr+spoken+english+through+telugu+pdfPDF 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_off0000c6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D5 17328 bytes
SHA-256: 02e2bf917ca6919837bc74ce1df86716c98dd1b26432b025cbfdcbb779e5304f
font_01_sfnt_off0000f3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 10864 bytes
SHA-256: 55cfb421ccea503e6ee6f7009d1c4db07070c369d3b25ba32b2afd7946f18096
font_02_sfnt_off00010c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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