Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db3b496a8eb7d58…

MALICIOUS

PDF

93.7 KB Created: 2021-09-16 23:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 56c1e34113af4c0d970e40b98682e499 SHA-1: 81c58d8855bee7e3ede9aa5137d700ba4c8d02e0 SHA-256: 2db3b496a8eb7d585992f5c21aa716b7aa5fba3e502b3ae174e39797547099dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a link farm with numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://wastran.ru/uplcv?utm_term=fine+lock+apk PDF link annotation
    • https://jin-ji.com/upload/files/54134892807.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/fitirusewet.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/55374953809.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/65996227448.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/sewovaxot.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/20260473430.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/70449960230.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/dudot.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/2121151708613d83649a6db.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/735d0fdf41120a2fdaf903c9a5d17bb9/59345722977.pdfIn PDF document text
    • https://oferta.lt/i/File/38345091792.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/22300507859.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e61e4c312d---85025503296.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c65651d593---malumabuburudizom.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/d8cc1c4218ca208a8787a033a8b24dc5/zazemisapanaluduwizezodu.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/83406422589.pdfIn PDF document text
    • https://diphong.com/uploads/38901463358.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/99667626051.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/87545741390.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/juzetamivuzubuludetewijek.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/48140882884.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/wijulikemaw.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/pilarefadedikidewajodok.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/87618963139.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/303c64636a751546276ae6399460b02a/japepipaziniponapa.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/34685652591.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/vubigutibixorupepawizinu.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_off00010a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001228e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228E 10072 bytes
SHA-256: e9b54061f33a09aa80ca1bfa95243bf4454b3e60155a95a1d83309bce0a3a868
font_02_sfnt_off00013901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13901 18468 bytes
SHA-256: e3e587123a6f999d923b7ca7f0622159c54ddebe1d743a056b320211342f4c17