Malicious PDF — malware analysis report

Static analysis result for SHA-256 80f4f7ee71e2c411…

MALICIOUS

PDF

75.1 KB Created: 2021-09-06 06:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2c5fa30f365fa40cef3a1fa27f23a430 SHA-1: 7b1c730405735f440e72b66b24215226f91566fa SHA-256: 80f4f7ee71e2c41139f189bc22485efcad4070cf1c2486131686b465055b4da3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm with numerous URLs, some hosted on compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cafesca.mx/ckfinder/userfiles/files/xobis.pdf In PDF document text
    • http://wsp.pl/userfiles/file/77510535304.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/luvun.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5124e82325---38384115218.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/14019036904.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/vesazobabaweporago.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/13884245400.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/sakineriroguluvafapixovik.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/fawir.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810345f0242---malexanoweg.pdfIn PDF document text
    • https://wildnaturetravel.com/File/69514507982.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/xijuta.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fac61cc9e---86246887989.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/24360606147.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c10be1921---13967473324.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/82798416752.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/34rps0gnsjcr04mrj76u1qchj7/zuzidobisidifegekevufu.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/87855474753.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/bb86987956ff1e16eb0c4a4fe6ecd380/mawigupitimetowevafufov.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/dce98048bcfab1512f815d935435759d/tawutupotozi.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/82328419808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=slopes+of+parallel+and+perpendicular+lines+geometry+worksheetPDF 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_off0000bee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE4 11532 bytes
SHA-256: 4b0cfb9cf1bfcd6f809f0360ca2b0f73365a37fd70be1b3b4bfd49f0f32721bb
font_01_sfnt_off0000d9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E7 17360 bytes
SHA-256: d7a575ebbce9ddc5fedb0024ae57e64fe63b6fde9262e500a0b029ed79b8d1d6
font_02_sfnt_off0001066e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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