Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c47a299ef3fb31…

MALICIOUS

PDF

85.5 KB Created: 2021-09-05 04:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 3288c1bb8a46ae7ab1746d241a21718b SHA-1: 0761015de4801bd8bf7d7c6e9d2f542b7e67445d SHA-256: 15c47a299ef3fb31c4136cb18731b245e8c6f5bf78260683382a3deed957db0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pixomot.ru/uplcv?utm_term=tratamiento+para+intestino+irritable+pdf PDF link annotation
    • http://narnivet.com/userfiles/files/jokomurujosimenem.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202108161045111834.pdfIn PDF document text
    • http://canoeing.by/pics/files/mepokasi.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/68384282804.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/67421434714.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/52685678507.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f314c8cc26---fokuvuwukuzakubute.pdfIn PDF document text
    • http://rc-modeller.se/images/file///66663085602.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/tetuzad.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/25et02rat1262ugqnia0agftgh/39598217710.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/59368203719.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/58315081585.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/97197808264.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/24415666473.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/gudefufuxamebebi.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160975ef19dfca---lelaseralunutekumefebinez.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/31222497a10c3f212eb660eedecdcb3d/zejofuvoven.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/e5620100fefee7a88443aa63b0083d31/tejetumirojugudeja.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/33801220147.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/ribewejamiromepulemofolox.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/98991405296.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/9e986935acef82ba514725c6b8e2e0a5/27293051713.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/9209774965.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_off0000e98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98F 18024 bytes
SHA-256: 2a9624bc4df4838ae62ebb7834a7665982c9870bc0d5236cd65dacdf61019a4c
font_01_sfnt_off00011794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11794 10760 bytes
SHA-256: 0a16ab41e816dec6cbf1124dc5f61db59520b0da893dc0ced42a1d339f3741e2
font_02_sfnt_off0001300a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1