Malicious PDF — malware analysis report

Static analysis result for SHA-256 d32fef3de433a605…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 02:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec6c48f021ca2fd9f079fb8b08258726 SHA-1: 9efddcc181a184a80cef8e177c6e4b6e114c3453 SHA-256: d32fef3de433a60554a7ba1abe099dbfd41f064577d28b93d9deb03ebfa4fd69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farms on potentially compromised CMS uploads points to a tactic of leveraging external infrastructure for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314b5d2f5d3---80563480192.pdf In PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133cb1144f66---lufovazajajigadum.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/bewimojima.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/39520502981.pdfIn PDF document text
    • http://jocafoto.com/fotos/file/jesajonoz.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/kupobalad.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/46842834471.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/95831304442.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/11755518474.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/46856023849.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/fujigarunaf.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/09c9afd0e33039f79e1cfbb1579e17ae/27684296216.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/31229286924.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/18090410465.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/verogesal.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/tisixinukoripegawuf.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/66503400845.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144ca92b8848---73538880578.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/togigi.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/52910270918.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/totuneg.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/38064548123.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/66329109667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=do+i+need+wifi+to+connect+my+phone+to+my+tvPDF 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_off0000ae9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE9B 10676 bytes
SHA-256: b265d2aba22f5ef6f9d98f848f2ae4d05375a5f5241d9527789ed5a0b28e7496
font_01_sfnt_off0000c6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E9 15764 bytes
SHA-256: 0927d6d386badb59706d7de41b53ab2f375aa53601a240e144a23f1431fa74a3
font_02_sfnt_off0000eee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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