Malicious PDF — malware analysis report

Static analysis result for SHA-256 5396861f6d361e9d…

MALICIOUS

PDF

72.3 KB Created: 2021-09-01 12:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f55aa4a35122854fc32a9d872c2e3b77 SHA-1: d41c4f0cdbc4eec1ce4230831ef55b4501aa9dda SHA-256: 5396861f6d361e9d9c9f0c7baa86981f35991b29d9fe3d4090a2ea78b22e2f8f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards an attempt to trick users into visiting these sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://pistant.ru/uplcv?utm_term=higher+education+system+in+japan+pdf PDF link annotation
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/30980714614.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16116d9d6c3137---41336019805.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d66dd4a1c15---fawobo.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/goxavi.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/tobibuvogewusuluraf.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/7409705395.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/vimenejaxir.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0771e0e7ac---karisemuperowokidoxuwuz.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdab0f2dd6---wowoxex.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611681ba166e9---88185322504.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae27c03cbc9---rigidabowadokuxoso.pdfIn PDF document text
    • http://coumert.com/images/file/zukal.pdfIn PDF document text
    • http://limoride.net/gallery/file/16567424369.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe51fc6d72---xemofovinugobafim.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/minewafu.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/kumelikukuloditutotizova.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/demimokixaradoka.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/26275320683.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed6c911ad1---63556648738.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/106005931.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/68941136291.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_off0000b99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB99C 15760 bytes
SHA-256: bd2ebd551feb76a9a2ca2eb55737ca6e574f70e3003d75c2ecc037d93afcf1c9
font_01_sfnt_off0000e196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE196 11356 bytes
SHA-256: 7eb5676959b8c112e015de46bb945f63cc5db04693b3ab45132b8035790591d4
font_02_sfnt_off0000fbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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