Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b61389921b0da75…

MALICIOUS

PDF

83.5 KB Created: 2021-08-02 08:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: fddce82054879d0dbb1789d5a6a30129 SHA-1: 2b7976fe47039f8f3f0617a29b2493896b3db93a SHA-256: 9b61389921b0da75eab9de2f2ade7b0115fe68f8e1f5badccd7ba892f3cf1e74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, directing users to various external sites. Several of these URLs point to compromised CMS upload directories, indicating a potential distribution point for malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/da9b8c976f7d39417361ee6e208a9a31/kemisobupo.pdf In PDF document text
    • http://espacioschillout.es/images/admin/file/xininexosubakokuzeboxe.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c6e065884---45693800890.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/9gipt1rk1lbg8gli8sblveh1c0/gasokisarufobi.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/14362679257.pdfIn PDF document text
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/81986812628.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/13958175950.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/danamotidola.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/32216223262.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ad2b5463c---91148637958.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/33056578717.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/7202958122.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/33553148705.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a834147b1d3---libofinemifiwixegekana.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/96250058359.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/83072125445.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/47378441066.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/4e9e9f8ce8d39a01d07f27fa08414bfe/1273375926.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cec4292df9b---vanutafexejelob.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/zawesedejifikegowoko.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5871aa7485---gonorodomevobaxumoxoribu.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/87744803939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=manual+gearbox+car+parking+mod+apkPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4942df70bf0c35f82e19c711be0a7359/mizazumupofokerobisi.pdfIn PDF document text
    • 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_off0000de0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0B 18076 bytes
SHA-256: e25c5b1a5734276d5b8c4fc046a6581162cb620dbccb47c9d1f45d5ed53776db
font_01_sfnt_off00010c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A8 11016 bytes
SHA-256: 846944258f47df2b7074720c9549a194432c3e75726dfe9ea329551b25518435

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