Malicious PDF — malware analysis report

Static analysis result for SHA-256 965d5c5318f318c9…

MALICIOUS

PDF

75.9 KB Created: 2021-09-01 13:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 302292efb417b73ee79778c063ea29f5 SHA-1: f06099cc65f0b388f70c3da52ba884bb36289e6d SHA-256: 965d5c5318f318c9b5a917fde8ebe21b40460cf2b5bfc74da25992821e3b17fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure align with common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nomylo.ru/uplcv?utm_term=tom+and+jerry+movie+meet+sherlock+holmes PDF link annotation
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/83315003841.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/jutososogukon.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/cfaa8cfc6c62a0397cb21b473f726c10/poxapeboxuraritapagifidiv.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/bepow.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/pozijaso.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/611d7989fba9873c1313b9f092f96a85/pexugedumok.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/kalavujojosi.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ahfq9er40ilvr1n746o8mqhm23/95353572796.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160898c14b52f6---sukudidezodejikem.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa024374836---feroma.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/ketaneside.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/63872977268.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/lulilulugelepujopateke.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f763e442f02672ad60d7381cf3f1a57d/289630440.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f09556cccd3---lufotilasi.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a84e2b7ef43---toralogolitufosadara.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/dafuka.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/48218195353.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/nujixajuviluraxaru.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e74f42af66a309786cfa61d71187cb75/fetuziro.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/ziloketib.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b583b9374---vezuvofexe.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16080f7f854821---seximagawadukosulugitur.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee59378e935---2766848296.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_off0000c615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC615 11000 bytes
SHA-256: 37e75f128913dd361802eed0b428b29cc5c31e4c0c07ee14c1672690fbb86a9b
font_01_sfnt_off0000df75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF787 16288 bytes
SHA-256: 53703d80036d7802b8afd95e89b27f7a1e84c699225944a9a3910c9fc2a358ed