Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e1e27c186acfdf…

MALICIOUS

PDF

86.5 KB Created: 2021-06-30 01:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6b2fac1d55bdb12fd8ccac8bab08057 SHA-1: c13f4514eb67e383aae541dc04e753bc9aec6a57 SHA-256: 56e1e27c186acfdf9ccc643c158e07069501e93281024df1ac54e5ed47b7efe8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users. ClamAV and an ML classifier flagged this PDF as malicious, specifically as Pdf.Phishing.Trojan. The presence of embedded URLs and the nature of the link farm suggest an attempt to deliver a phishing payload or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://www.puhito.hu/uploads/vodisatavidef.pdf
    • http://asustainable.com/global/file/wuxojolomubiferukadoj.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a84232f104f---79222683201.pdf
    • http://nuocmambason.com/upload/fckimagesfile/a4adad0bcbe7babc9e4679b3f8e8d297.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/e254dbfc695f8daee5dd64b69872b713/73182239828.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608246d7c367f---58055391689.pdf
    • https://tailormade-sales-marketing.com/userfiles/file/52805592830.pdf
    • http://robbes.nl/media/files/dibagulasevili.pdf
    • http://studiotecnicobonoli.com/userfiles/files/69377258928.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741acd1cf95---39204350803.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e971b302c8---xabefamunodiparozi.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e36de54f80---vabozuboxoxugovigikam.pdf
    • https://www.mds-horizons.com/upload/files/37680345843.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/8176dvrein0fkfevo80tsvefa7/zokonimowoserup.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/e68d9ddb4f087ce5e844178925dd3ca5/24706378357.pdf
    • http://www.cafeinca.com/img/public/contenido/file/63005530281.pdf
    • https://likeevent.it/writable/public/userfiles/file/wuwudopofo.pdf
    • http://xinyaoqiye.com/upload_fck/file/2021-6-14/20210614034727434120.pdf
    • http://www.annaleehuber.com/content_files/file/45495174295.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1edba22c0---kurafu.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609305fe2c4f1---xetobo.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073db93332d8---bedelinejetuzusaliweruz.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160770e375eb79---dagibekamatipedugu.pdf
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210618_59665ACA318E910F.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/gmor2gjk3h7l1pi3uqiu112617/37195846463.pdf
    • http://jfhconsultancy.nl/userfiles/files/rujizowonotujejaniveme.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=electrochemistry+experiment+report
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecec.bin
96482f68f1b2b9da5a6984038e45d5fc1eea022a0545c3547f73567056cc2c01
pdf-font-stream PDF embedded font (sfnt) at offset 0xECEC 17992 bytes
font_01_sfnt_off00011c13.bin
985523cce6e39cd35f62b5e695a95bd19640f9d8fd55204562a9a414e342aa53
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C13 10676 bytes
font_02_sfnt_off00013462.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13462 16792 bytes