Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b9e39cbb03577a…

MALICIOUS

PDF

72.3 KB Created: 2021-09-26 02:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0ad44ff09068c2d499d18be4ad2fa041 SHA-1: cd6e7d1e7e3116e2a9f4f5a68c105960a466a83d SHA-256: c4b9e39cbb03577a937886bda2de447b1f1f17b1fbf0866e977975ddac91bfbc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with several pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites.

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 http://nagymester.com/userfiles/file/piwatulorevivawax.pdf In PDF document text
    • https://carrieres-pierre.com/userfiles/file/wugubotolagamaduporu.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/ragedobopitur.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/75940114731.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/namuf.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/weveto.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/bunegujikefepa.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/73166882782.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/95214015580.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/46284704232.pdfIn PDF document text
    • http://fkhd.cz/data/img/11573915079.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/76243826353.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148b43d46ce0.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471d3a33446---52090535341.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/mijakapijetavot.pdfIn PDF document text
    • https://sadex.pl/fck/file/tivarufubajul.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///foruzetakariwepoxe.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/befujuxaxemululojaxe.pdfIn PDF document text
    • http://egitara.com/upfiles/files/29623539697.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/wapivujawatonumomeja.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/lofogebuf.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8f249b81f---dipefifawitenadiri.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1614f8f63030eb---kafokogefo.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/92950388230.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/16899370960.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/21557471370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=can+you+download+vidmatePDF 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_off0000b6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEED 17340 bytes
SHA-256: 5792f7a21b20c0bdaa16eff179d15726b744e3d79cf57210c341038125d333bc
font_02_sfnt_off0000fb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6A 10540 bytes
SHA-256: 9f4f46162e5eab6e8bdb33b77f8f65fb65c67db0400922c128910f34f3976d83

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