Malicious PDF — malware analysis report

Static analysis result for SHA-256 2592a89227328b5f…

MALICIOUS

PDF

80.7 KB Created: 2021-09-09 01:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: edaa472cfcd9f98197db9be4ab94f4a5 SHA-1: a9bb1fabaf45899550eec6328bff737c601295a2 SHA-256: 2592a89227328b5fb069a4f6e7c9cdb0ca2b384f7c5e70108338f3a587840cd9
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with several URLs pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. No scripts were extracted, but the structure and URL findings strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161392fb044d63---483155634.pdf In PDF document text
    • http://tksvolga.ru/userfiles/file/22004321962.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/3129218596.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f159488317---lujoxededafob.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/rufilix.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/vuwenar.pdfIn PDF document text
    • http://letdentalab.com/img/files/nanuwuturemigovejebelukep.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131f22a6b85f---95816575450.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95744326677.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/tugim.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/90213541773.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/gemuwizu.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/kodivaluv.pdfIn PDF document text
    • http://teplospectr.ru/images/files/dexemikusovekojidixifo.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/bavusaloba.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/dixurewurilevalopusupaza.pdfIn PDF document text
    • https://moolans.com/uploads/files/wutazoranalefuzuwirenox.pdfIn PDF document text
    • http://chipgene.com/image/files/20210902_192438.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/8609588829.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/sapalegogikofisuzetuximo.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/54704727432.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/26316255150.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/xiveje.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/begejixunemazabamebawaka.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/debabojurota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=hd+streamz+live+cricket+appPDF 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_off0000d6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C7 10660 bytes
SHA-256: 468a79337f3bbe7147421c54621c357a1d056a79e467cc50dccea8ff705ce8ee
font_01_sfnt_off0000ef36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF36 18152 bytes
SHA-256: f5dc2611afac7fb441b84bdd2fe3229c701fd96db56eb8398b8515c31695d274
font_02_sfnt_off00011d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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