Malicious PDF — malware analysis report

Static analysis result for SHA-256 4215b3f430bd8ade…

MALICIOUS

PDF

81.4 KB Created: 2021-09-03 06:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 28064100815b83148d63d25443f9aa1d SHA-1: 9cd4cd133c04a6cd0e84ebe8936b278e64644d12 SHA-256: 4215b3f430bd8adec8fadc0bb56a7c50cbb94bda429d3f66c945a1635eb5d066
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to lure users into clicking through to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://huntic.ru/uplcv?utm_term=naming+alkanes+worksheet+%231 PDF link annotation
    • http://hasici-pristroje-eshop.cz/files/file/12827149529.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/1f7f9083fd7f4d59d0dd4d6e3e92e19a/netetonisekuv.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161052da77660f---repomofobijoxudeli.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/sipixov.pdfIn PDF document text
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/morawunejune.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/40476447662.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/9522433965.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/fonutasebozes.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160812e5d10db7---fenixosomililulanive.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/16093110207.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/11b9370508943ece1e55d120bcf163b0/vagisuzisegutimodakeleve.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/zibodomemaj.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/74dc95e32a4441508192aad9cdf7d31e/49485930669.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/cb46ed0baa389356681039164baf8471/21022507938.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/p99n605hg9h8uvq7hjggpo2fnf/bovutibukazeliwafababoso.pdfIn PDF document text
    • https://nevisnews.com/userfiles/zokufoposo.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/zabatimifimepori.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/jasapizaw.pdfIn PDF document text
    • http://rnsnider-classof-68.com/clients/9/9a/9aaec9a1f64917203b32d8bba7bf2533/File/16050359831.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b12f0094f76---sosepibosatijamidemudo.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_off0000d7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AB 18312 bytes
SHA-256: 1e672ffedf889697b560fe313b71565cfb438b47216503c0f12a0c9498c9a7fa
font_01_sfnt_off000107e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E1 10708 bytes
SHA-256: 6f8fec1927ed687f6293c118a9e924584f163d2f30e6cb4d486704617000791b
font_02_sfnt_off00012051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12051 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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