Malicious PDF — malware analysis report

Static analysis result for SHA-256 8174cd26b8f9ff3b…

MALICIOUS

PDF

129.0 KB Created: 2021-09-02 19:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9fd6437c1cad58c973ddcc3e3bdccc44 SHA-1: bd5d913e5be71793a0c271fcd768e28df7c52faa SHA-256: 8174cd26b8f9ff3ba66d31255690e20bad17b72fe33ed0f7c1967606f46bc1cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the structure and URL patterns indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/febodazo.pdf In PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/q41r9ldnbk1jk761vbqsd4ccv4/8297559502.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/xinidikisemo.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5518600ac---52976802615.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/bigukedarafuzuxuvexa.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/e80b2caefcd61ffe6b214fd5db9d8ba4/pikorafaturumupeworum.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf8f58c02e---pisivokuzataxive.pdfIn PDF document text
    • http://enricobarraco.com/files/lovabewebi.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/6cip4apur222jg8tr1qdsv84ds/29010647723.pdfIn PDF document text
    • http://starrsgazette.com/admin/images/file/lowigalipedetuf.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d7566190f---puzar.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/la1qr0sadfmrbva38vbdo9je01/zepewizaw.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/3b336183ef5505898e8dfb9b34b86f75/xupumenom.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/13b52d63a6fd07eea568836cfe8544d4/zusoxom.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/f39f221c178ed3422e275c31211546ee/4181239050.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/tesuxusa.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/dcc852db96cd8f0cfccd99c35afa71a8/fetebidad.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160beadfe876e0---24899575649.pdfIn PDF document text
    • http://aven.su/userfiles/file/57040330491.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/leguxijuxuvimur.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/legizon.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/vanafazamufinudebufur.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/vulasuvadifabi.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ed0914699---25047946365.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=2004+cadillac+escalade+ext+manualPDF 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_off00018de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DE4 10736 bytes
SHA-256: 88ec46348125d7ae1d23c9c73ee47b4f15947eb14fdb7c1b7a3b8ac47c2dc513
font_01_sfnt_off0001a6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6A9 20984 bytes
SHA-256: d022770ad76cdd0b3ff3cc65b99994b491acc29ac7b39666797b92674e47f7cb
font_02_sfnt_off0001dd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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