Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4f92c3248c4840…

MALICIOUS

PDF

93.2 KB Created: 2021-07-21 11:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d5b8a6e6dcd6d51b5e6630abc3322142 SHA-1: 6f4d6a4f6e9175c94738bb6ca0fc4472db4c1b01 SHA-256: ad4f92c3248c484002bfa7c96cadba983e9688a8aeb8e83a7ac6a5ec19edd8e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised or disposable hosting sites, which is a common tactic for phishing or distributing further malware. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://recapress.com/ckfinder/userfiles/files/57054790231.pdf In PDF document text
    • http://autoscuolavalerio.it/userfiles/files/dipodasidotiwanuterasis.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/iuadmmuq05u8dh2o3krjacf7g7/37194607045.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160965f770f564---gosexifigixarapola.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/19040137875.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/loxinomuzapimejejafoxin.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91856629756.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/magoruxanozitiv.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c66b48a0cc---68286626686.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081a0f80a216---nofula.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4b94a02e4---jezipotilaporituzanewob.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/16147682544.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cad3e756e9---92167781658.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/8cef0b499c229f40586cbfa99017cad8/90239545588.pdfIn PDF document text
    • https://eucolait.eu/userfiles/files/15747903234.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/nofagafufesiroxale.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a063ca14f441d7e44fb4d2559938725f/bomufide.pdfIn PDF document text
    • https://nexusmediation.nl/files/53976633890.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/7gut8f2sos81geo4t23tc2i7g3/wemelofugatuvitod.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/aadlf64v2jo5jjekc9a0ua019r/xudokumanobadaxedat.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/dopuwaxodetu.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/13277856365.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ranch+house+second+story+additionPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5c7932df6---32671788495.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 16300 bytes
SHA-256: cf48b691868a259c9a47f330077ef157433a70b9d03653b9765cd482506ba2f0
font_01_sfnt_off000108d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D8 17492 bytes
SHA-256: 7bc59abf23be9e6a56b052f915588851d454e7b45658bf7400f8775dcb038871
font_02_sfnt_off0001367c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367C 10680 bytes
SHA-256: c08fd3035257df4e34ae2d4a4521b76952945695d0414f1c480130a3e51d9864
font_03_sfnt_off00014f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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