Malicious PDF — malware analysis report

Static analysis result for SHA-256 9622359dd762d98f…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 06:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 84a59d32518bda8cce6be810a246c48f SHA-1: 5b59f725efcbca7b90cc2ba166b7d8c0e1dd1729 SHA-256: 9622359dd762d98f4ced4f6a18fd8a11fd20a542cdef6f81bea87cc2d9ed9da0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a browser extension installation lure. The document contains numerous links, many pointing to potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content or downloads. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest it may contain embedded JavaScript or exploit code designed to facilitate the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://elijasprojekts.lv/files/file/danezokexumaradijima.pdf In PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a7d63334e---10185809467.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/3e006c6eaa1f865d8521409befbe8480/luvetaso.pdfIn PDF document text
    • https://agermag.ro/mm/file/desojokidowewufixobib.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/kavubotaka.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/lojimoxe.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ums3esk4q460bicmol268a1bs/62704253430.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/penupubutewuxobojapadage.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160871d1b1b998---58299390460.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/41131964932.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/kovapapawopoxes.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/81392991008.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/42538920742.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/42688338441.pdfIn PDF document text
    • http://dienmaybaongoc.com/ckfinder/userfiles/files/xilevavanerofefakawife.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/71562568767.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607404dd21417---kuzok.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/54374470125.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099afbfce405---tusopixejifosujubuwifevar.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/55734331401.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077da95dee4b---38424562758.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/bujudagajemola.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/tifibefevatawudebone.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/490bceae8be94b358200a47c9ce8f3f0/26357504260.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/piwuxevufopopolosifaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=head+first+html+with+css+%26+xhtml+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_off0000ddb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB5 10596 bytes
SHA-256: 515c84362be7e01318423c797ebc4916ad2aaa4f7f2e81dd883e4fb4a081ae4d
font_01_sfnt_off0000f5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E2 17268 bytes
SHA-256: 586e7d1b54fa997ec2ac246e0fe3f9bcd59de05f25a1ccb3a367f4c39bee26a2
font_02_sfnt_off000122c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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