Malicious PDF — malware analysis report

Static analysis result for SHA-256 c537c6155e80b911…

MALICIOUS

PDF

84.3 KB Created: 2021-09-06 03:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f0dfcf41467b60113565c6c6ff5b3b68 SHA-1: a00ef33aa372d39a5cb73c706f62e883e23acf7f SHA-256: c537c6155e80b911ff7ff1f6aa1df939ca8dcbca9bfade5f31b48dd65895c14a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further payloads or phishing for credentials. The embedded JavaScript is likely used to facilitate the redirection or download of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://mundori.com/js/ckfinder/userfiles/files/31572623794.pdf In PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/45506658799.pdfIn PDF document text
    • http://moawin.org/editorfiles/userfiles/files/gosefewavepavasanowexur.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/lulipevulijitonuxomipiji.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/fezipagokez.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a512e5953---78626613808.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607016328abe4---femokumigas.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/4f0bbed54419ce6c08caa94c1a6e8f2d/mozozorubitenuvuxilivuwe.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/25450008882.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/dokejipepi.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9dcf061d4---lexoxumumere.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/48274457279.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f7ca7d55946---nazezakokagu.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/powepuritepesogemax.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/82575507502.pdfIn PDF document text
    • https://digireg.com/upload/12018304593.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609283498305c---92597988355.pdfIn PDF document text
    • http://lakehighlandsrw.org/clients/863582/File/wobotubozafa.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68d21228be---31226837131.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/3902778ac26636b97c93b1c2ee327600/demeduwevivup.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160adf8f8525e2---14441780838.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/a93092b27d3d6e09a4f4e50d68ae0579/86139747983.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/tubimi.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/17070c1ed63210ae49206a190f44f303/95564798207.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/lenit.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/dla8hmnbv5sc7jd98vvig1ng71/lamuponezozovumomekexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=photo+to+pdf+converter+free+download+for+pcPDF 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_off0000e59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB4 10608 bytes
SHA-256: 75dec0fa62f41bded45a3cf68c64c4000ae195310a3610d8114f111c593fe0f0
font_02_sfnt_off000115fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FC 17464 bytes
SHA-256: 19baee0dafe04ba3f260d9feac816183a0b615e55da2666e15a86f9e2398cbf5