Malicious PDF — malware analysis report

Static analysis result for SHA-256 338fcfb76c4a866f…

MALICIOUS

PDF

72.5 KB Created: 2021-09-17 13:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d84278ee2bd440dec31a21875de50070 SHA-1: 4b093eecb9f41af06c43bc1361945cd597c8f382 SHA-256: 338fcfb76c4a866f6de6817096e065524624efd35011c2374677503aaa27b2ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external links, many pointing to disposable hosting or compromised CMS upload storage, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead the user to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://ketchas.ru/uplcv?utm_term=vk+dj+%D0%B4%D0%BB%D1%8F+%D0%B0%D0%BD%D0%B4%D1%80%D0%BE%D0%B8%D0%B4 PDF link annotation
    • http://halmar.info/userfiles/file/talikidilagulukik.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/tajetepobenutezuna.pdfIn PDF document text
    • http://manu-transport.com/documents/file/gabibezi.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/23363674424.pdfIn PDF document text
    • http://movediary.com/userfiles/file/tejor.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/karolokesiwuvinopejedaz.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/dazanoner.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/vezujutojolape.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/96087753649.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/77132352406.pdfIn PDF document text
    • http://ccshecea.org/upload/files/domujerosorodus.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143f564eb8b8---bedejifekuf.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/kubomijolut.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/wejofug.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/lamaziwulizemoj.pdfIn PDF document text
    • http://cafesca.info/ckfinder/userfiles/files/jugajilom.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f54375e160---gevobu.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/vesag.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/34759199315.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/00e384cde264ebc961759676e9fedcfb/nogis.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/28326200550.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/49294782443.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/f850d2a45de233bb517bd5d4f09d1579/17343442578.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/99235366465.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/55363579507.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/57442918627.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_off0000b604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB604 18256 bytes
SHA-256: 5253bc423f4b63f1d8fea83161d03fffb0ff5966dca85f7cd4719a3c39e6c045
font_01_sfnt_off0000e335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE335 10352 bytes
SHA-256: 87e1ac250eda062f1837fdeeb5042ce268e570ffbd73d949d1a3c1b0bcfd5d88
font_02_sfnt_off0000fa98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.