Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbdf8c58727903eb…

MALICIOUS

PDF

74.9 KB Created: 2021-06-10 13:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f680acff579265a2d59ad04405d81a4 SHA-1: 9917638da0f6a953cb9039760f96892f5e5c2810 SHA-256: fbdf8c58727903eb419303e4feb721a85dedf41f950300f5f0d64a6e0c194f5b
156 Risk Score

Malware Insights

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

This PDF document contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, contains references to 'free fire hack diamond and coin 2021', indicating a lure for users interested in such topics. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://huntic.ru/uplcv?utm_term=free+fire+hack+diamond+and+coin+2021
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973e7461bf4---xetukereboperasemozaxoso.pdf
    • https://twfern.org/upload/ckfinder_temp/files/20210530062346.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/mqjntredab8ht78tkbhkbgtvth/kufuvuturuxavedufegi.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ree2p87ffga2v4u3b0vonpg209/98683498945.pdf
    • http://itineraire-consulting.com/ckfinder/userfiles/files/48277642604.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607220412c5a8---89682958534.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vg6cmhh6oitqsi73162t38tm07/tisigesikumofapudodopogul.pdf
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/26048136009.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfae5a7b4b---5835525052.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085249fdf646---99543939949.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16084722a94cf5---wopuxejurapena.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16095b51b411c7---femudiriwobupetunidogokuv.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/j68puoqv88871dfdpgcr8rhucn/sofus.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/37305e2bf06b95fe9b61ef2fa01e9e35/kipet.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/lkudnadb3qnvob7ftado6jj7du/18273212585.pdf
    • https://nepalipublisher.com/ckfinder/userfiles/files/dogododajoraxitogomev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e932.bin
cee7062b2919473a0d0509ab34660847b91f8f0aed0d6a5b96b191c7350cb66a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE932 5396 bytes
font_01_sfnt_off0000fb69.bin
bac981e346caf99a807585c5633d599e71ecd2727edd94ec00accbb06b815a47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB69 10360 bytes

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