Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd40d51dbdc5d38…

MALICIOUS

PDF

77.0 KB Created: 2021-09-06 22:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ba4793959c3b68ed2252640c9a24d980 SHA-1: 843691b58a9668b8ded3357691b7be514382a2d7 SHA-256: ddd40d51dbdc5d383a02d3e50c0c0b827685374bdf60ed55e1aa34eb25d7f214
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting sites. These links likely serve as a lure to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/99ed3c39c8731603414255157fff2b0e/45836663569.pdf In PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/mugodiwewitoxogopowolodor.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/08a8b0da0bf48917a5e03b7c60647c28/72443499520.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/30458666853.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/goleraxapizun.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/felot.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/54135549315.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/24011964081.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/jemakasagabomurasav.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/musefipopoguvifenomoxux.pdfIn PDF document text
    • http://abwessex.com/uploads/files/rafexonibajibudinef.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc761da9f2c---kukaxobalufajasuliwod.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/22181038472.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/409480483.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/kumogulodomuvesulilefivix.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/1o54b2n5tsh7ect67gvljl08vb/13470502177.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/f0ceed47f8654d0257887d7dab0fbddd/fegabekosela.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/c0d1520e661e87c1cd7f6b3f53129a58/viwejimovefagitidajezuxaj.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f72eeb645f---wubolomeruvulobo.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/95235470097.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/rusarabede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=faulty+sentence+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_off0000c8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F2 17664 bytes
SHA-256: 2d539dc8f6e9e40255d51264bc5a26bd2636ab439e952dd095dbc33e1a01e296
font_01_sfnt_off0000f70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F24 10492 bytes
SHA-256: 6b56e20998fcbcfe28808cf6db80ac452b0ceb24e3f233ccadb3b8b7b8fe4785

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