Malicious PDF — malware analysis report

Static analysis result for SHA-256 629ccf4f61ff0971…

MALICIOUS

PDF

69.1 KB Created: 2021-09-05 18:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a2a348d1b7721ea63b4673db186e1bee SHA-1: 8108f9202ac6b635eb17c8765b3acb59bc3f28ae SHA-256: 629ccf4f61ff09719dad5c8167b9d4c618c28f92c36f1f6da5e331120fc8dedb
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate this phishing or distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://s8radziejowice-paszkow.pl/userfiles/file/wuveteluduworejasuvive.pdf In PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/rorovexep.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/99664175120.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8fb5811f3---77666525323.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/vajewiputugixet.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/suzovufofodamejux.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/rikarodokijererex.pdfIn PDF document text
    • https://corghialberti.it/file/jewolotonaxoman.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/gesaxoraro.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/9tj1d6g14uiiut4pbm3bbvqohq/66704891282.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/37999683454.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/jabetaxajubisodu.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/somuwokerepovunajubarewim.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/1g8jrttf0dg9qjhm4ks7d2c58f/dofixorafalijafu.pdfIn PDF document text
    • http://amouage-salon.ru/admin/ckfinder/userfiles/files/42383757046.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/wemokafubigogodojo.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/brl0pvk1l13nr9gf1mg8k187t0/6237613663.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/8c5d626945163c51ef70b095b433cb5c/xaroxugepexem.pdfIn PDF document text
    • http://usmleworkout.com/files/file/zakuzadupojabovi.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/regutedivuvuzupan.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/donewalajavuge.pdfIn PDF document text
    • https://marosme.ro/hirek/file/55427997976.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16083303f1f014---daratojebebes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=afrikaans+language+notes+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_off0000b265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7C 10848 bytes
SHA-256: 547e108e512cae86b767bed693e4aff54a6b504d462955814ceba8f847859323
font_02_sfnt_off0000e36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36C 14060 bytes
SHA-256: a323a824ea90d632518a8545b5fb240561777bfc907f8d0534beac660ea193cb

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