Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75377ab1efc15f9…

MALICIOUS

PDF

190.0 KB Created: 2021-10-10 05:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9e147c22a7d090257c8552c902da362a SHA-1: bdb14588957cb2820f1e077fdc24f2487572ea7f SHA-256: c75377ab1efc15f9c55181416b8656bce86a844b0d806395e7314bdff69ba81c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as part of a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://rajatotogroup3.com/contents/files/38370424983.pdf In PDF document text
    • http://terralis.net/catalogue_dynamique/file/folabolujo.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136394d0f4bd---binoxegobadazopexubuziku.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/11848395321.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/41598052581.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/rilonadodijinaluk.pdfIn PDF document text
    • https://podimercrm.com/img/files/21032451013.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/dasanim.pdfIn PDF document text
    • https://funbugs.ie/files/file/maralojopa.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/keguxugaru.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/fibawigefatuka.pdfIn PDF document text
    • http://tencanpowder.com/d/files/fakujipenunifogorizasud.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/tunaxa.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/muwapijiruwomi.pdfIn PDF document text
    • https://drterrace.com/london-100.com/userfiles/file/18536230959.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/7d6c9448f7c42bce457180dfb465a68b/26034902844.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/63530451967.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/41366474486.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/vubejamosefutoji.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/95409662849.pdfIn PDF document text
    • https://noddy.nu/images/file/nilapujofimadifonawobavut.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/35481901674.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16158aaee74cc6---32432808964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+first+monotheistic+religion+wasPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/79801073892.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_off00027b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27B18 23904 bytes
SHA-256: 4141dfb6eff3d9836a2ae374e4776131dbe3b477bea726cc1a6b156cbeee64aa
font_01_sfnt_off0002b868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B868 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002d07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D07F 10832 bytes
SHA-256: ed078a2943cd00e9ebda1bcabc1adec80e3ef280d7998bdb8b7ce87bae0ffacd