Malicious PDF — malware analysis report

Static analysis result for SHA-256 097cee27a17ac62f…

MALICIOUS

PDF

94.4 KB Created: 2021-08-12 12:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b7d592157a2db5d6eba10ab54008081 SHA-1: e8ecaa496b0a341796a01acfe591ef0317fbfd06 SHA-256: 097cee27a17ac62f5d044d0d8b4777c204d3dbd4ccfedb09078cd8ebfd2679ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the PDF and the presence of external links suggest it is likely used for phishing or to distribute further malware, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://foto-klub.dk/userfiles/file/kelovivojomopefifawe.pdf In PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/d0e248c0aa91c20bbd831c95a0a6cd64/dubusidojuwuko.pdfIn PDF document text
    • https://advik.net/userfiles/file/marifulatibig.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/xuxisarozabiw.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a7vfrd3733tnlnlk3aotm96rem/83263613327.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/91633385961.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a862372ba44---pelupiwalonokifepujanef.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106110502.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c92792b2e5c---20282475704.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/39100704972.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/90445011850.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d9ffac452---fofegebesagofejabefirofo.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/4a8dc775fab803372fbe5867e77e4df9/wadavivimadigeferokol.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/mekedurutulolufebuwujez.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/05650ae70a16b6b37a99b171128281e0/mamonezamazuzuluwegijuru.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa955c9e24---32056942335.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722c16ebc95---45274675788.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a368c310f24---70250304167.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8f2938e49---tifuxizevutuzijemanabowu.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/fatokiwuzubaromilipef.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/37100a9e64e0e679c49239033f96d86e/90984830607.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/borituxafixisusoko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=what+is+n600+routerPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/dajezutixevuxidilenovaz.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_off000110bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000128d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D2 10540 bytes
SHA-256: 8529e26220099da5a7a27877591753966441b5829cd647882f016adc00ea1f34
font_02_sfnt_off000140e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E0 16532 bytes
SHA-256: da87cd67198c3b3599a2e6989a63d96692c499d6a8ce8e189b220248c84ab53c

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