Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ba826f21bb0b1b3…

MALICIOUS

PDF

79.0 KB Created: 2021-09-23 12:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c10a0fbc3891eae9a12774504d6c1f33 SHA-1: a291cddf26cfcb6c9a283fdc265a99a06768d9f1 SHA-256: 9ba826f21bb0b1b3caacf87266cace23cb0fe22c5fa899a01265d6936f8e11c8
156 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 phishing or malware distribution attempt. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to direct users to malicious content. No scripts were extracted, but the presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161411dee8cdf6---21876289346.pdf In PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/xewexadevixapamo.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/mazemu.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/nomebavelasapinixagu.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/91280260154.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/13171997237.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/28166790234.pdfIn PDF document text
    • https://songhong.info/userfiles/file/31959768703.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/8fb34969df6ebdf213ab87ed133e7361/pojefekuruvibuv.pdfIn PDF document text
    • http://princeverma.in/uploads/files/3974007835.pdfIn PDF document text
    • https://matricula.hssanesteban.cl/files/woted.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/54056064709.pdfIn PDF document text
    • https://wecareprogram.org/images/file/50084186547.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/38475603286.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/37259430895.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/32227651092.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/18782172093.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/5037ca92263ddc1772ce891a7c9c8069/95410613724.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16133582f719ce---27830922700.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/96851862999.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd445174a5---dulaxezakajolike.pdfIn PDF document text
    • http://planbmedia.hu/files/1968712713.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/rusafunorosodek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=those+nights+at+fredbear%27s+remake+downloadPDF 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_off0000cea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA3 17572 bytes
SHA-256: 1d30c5b87a5d6fab6734f1e8a391df5e7382edd42e1eb29cc1264752573dbddb
font_01_sfnt_off0000fc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC60 11116 bytes
SHA-256: 5f92e96a14147b1f86ae75e02972897e109240fc9f4a3dba0a2fff01e49103e6
font_02_sfnt_off00011610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11610 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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