Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4cb74978951c7a…

MALICIOUS

PDF

77.9 KB Created: 2021-07-19 06:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7f9e5a5ecc53cfe2298613812d67b69e SHA-1: ca8b71d2812fae280b9b61fa6f26c3f39755965e SHA-256: fa4cb74978951c7a746845a0882ff810d1b796ff0b1dede967c56504f9dd32d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDF files hosted on various domains, many of which appear to be compromised or disposable. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous distinct hosts with a single link each, suggesting an attempt to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://nashcentralfalcon.com/clients/d/d5/d5bea9c86035def548a020f7371d19fe/File/kenubafit.pdf In PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/a40be8830421617601ba876fa41ccc44/tavoxawuzafu.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/bonafi.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/48080541590.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/7cdgfat2rpefs6qd0h91k8f9q7/93910346059.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609098b7c4395---posuwasinemoruwusemuzor.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/33735158875.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/92700497208.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/6e636f3574b3fb29e644f9f7f58710a5/netinabudajepobekonizipi.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/15203633522.pdfIn PDF document text
    • http://vasamo.org/pds/userfiles/files/67928749762.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/benaj.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/419b085d257c2469db6ce58363965ec5/70775232692.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/7544277120.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/babuwemakupapukubo.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/21875821442.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/0acc3e7c89e14e3fe145ca197e79e490/57102618667.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/b900cfba9d9ce00f2a415da3d97cc178/wivusivepapepapufomegi.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/568d761f864b3121818c49e80d1b5cdf/78570539418.pdfIn PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/xonejojuxopa.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091ecd36132e---16437973529.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/bajutoziwerejoperokajume.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8228584181---36527968761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=download+mod+apk+subway+surfers+new+yorkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5F 17664 bytes
SHA-256: f28f4f737594b1c67aa00c52175ff6333f0f57a6ec0502cf18ff82e4f78a5ea5
font_01_sfnt_off0000e8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D4 4228 bytes
SHA-256: 2d6a3a18c33e8575d5b441dd677c9b85365bc18e37be2b703ea5a55aeec23c29
font_02_sfnt_off0000f929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF929 11000 bytes
SHA-256: a05a1bb4dd05971a44ed9336381634736256eb30cedb276639f84a178bcc17dd
font_03_sfnt_off0001128c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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