Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a7fdb4c7a0674b…

MALICIOUS

PDF

79.2 KB Created: 2021-08-03 12:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 964ca064d57715e95ac929bfe27951d5 SHA-1: 1969079e7cec0f44d3e25331ce435c6eb96455c6 SHA-256: 41a7fdb4c7a0674b46dc92c9b62699702a9d1fc1909c93f4b1b807cdc8cb3ae1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to compromised WordPress upload storage and disposable hosting. The 'Password-protected archive handoff' heuristic strongly indicates the document is designed to trick users into downloading an encrypted archive, likely containing a secondary payload, after providing decryption instructions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084142a2279e---vamujiranove.pdf In PDF document text
    • https://abofahed.com/userfiles/file/57586313812.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d645161c60---85954068301.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210629034435_1641660692.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/kugajukevera.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/89129043676.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/tobegofoji.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/99f8ef000f9a67588e1e6efa5ce42416/71672927689.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ba928ab01f75fbea2f7444a0c1972055/34665954281.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/13492278570.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/67g98ngfdqcngapi439he5mqur/60014608229.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160821bacd3e86---murigebakupi.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/rirebo.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd606fc715f---56926385585.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/319ba700cfaf74a63d6c1768cc887311/kufukakabotadetozaj.pdfIn PDF document text
    • https://edbcagliari.it/file/29405970646.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/masixivez.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/39898574383.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/m8gqm4l24mrtiak81je95il93n/virajojupebuxotilipelak.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/bugexu.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/okbilds7ckf11moj4c45q245dh/rakifuzoxevulolozetukid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=principios+de+anatomia+y+fisiologia+tortora+pdf+13+edicionPDF 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_off0000ce54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66B 11300 bytes
SHA-256: 78125f53430fac6559bb6c209ed6d05310018919bb939811eec886895e5cc25d
font_02_sfnt_off000100d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D9 17384 bytes
SHA-256: b20892c0ca2968a7942cd0f4223f4c689bf9594211e7186ec60365e2abfe746b

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