Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a479dcbe9b6bbe6…

MALICIOUS

PDF

93.5 KB Created: 2021-07-10 09:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4dd1df5b7c8531f0b91321c21c3fe704 SHA-1: 41fdb9578460fab00dc2267e0cbc13eed2618aad SHA-256: 4a479dcbe9b6bbe693509d27019fed2071e0d622c044e7dd8cb51c9dfa54bdb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5521f1efa---dopiwuji.pdf
    • https://chinese-wall.tw/upload/files/furowigosoxuragowegowipa.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c744ea34d1278bb5a4ee7122b2efec8b/xegulozigowe.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081b5ffbece7---30876740726.pdf
    • http://castrolmintabolt.hu/images/upload/file/2557875966.pdf
    • https://discoverthesky.it/file/39548234259.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/900e4552b128787b9dc66313759cd4f9/zapivoravebibaramaz.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9cc650680---kojonebuzagedisawidam.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/1m6k23ekn4tv14136ojhqrjr5n/zadonopofominomegof.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802f15a05b7---49206340523.pdf
    • https://nguoixunghekiev.vn/userfiles/file/pirijotazibeged.pdf
    • https://ascinfratech.com/clientprojects/trading/file/69867546275.pdf
    • https://thingstodobahrain.net/ckfinder/userfiles/files/4487661435.pdf
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77999862950.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609273e6b1f46---ruwulin.pdf
    • http://electrogalicia.com/electrogalicia/recursos/archivos/mixesumojokijulabota.pdf
    • https://aartipalette.com/userfiles/file/zudefufokimatazimipow.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0e5dd54f9---54900863683.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/10b896dda8fc12ddcb850a974e209818/rizutukavuvapomiro.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d6591348c07---refugex.pdf
    • https://akapacha.com/userfiles/file/mogipesoxunowit.pdf
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160902371c37e2---7655589159.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/be0525778f750e8998c70f2a1614ff7d/84411740570.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/d3d3c887b1ad228a4b268821ac930c48/73991852625.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a910ee3965d---makaleruzexofakutakeje.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=tomb+raider+movie+download+in+isaimini
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a79.bin
586303f4d4e109f54bba9550a56b14771892c47dfb5eaff9e8d08e73c02cbec8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A79 17392 bytes
font_01_sfnt_off00013826.bin
754349b355e3c5670cecf1f8d34a7dad0d8ac062713ca6d26fb0a4dc234f67ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x13826 10568 bytes
font_02_sfnt_off0001503d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1503D 16792 bytes