Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b40f9922e9242a…

MALICIOUS

PDF

84.7 KB Created: 2021-08-02 01:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2210f60b9ebdbdfd366409c41d25775b SHA-1: 6e1b9a6cb53bbf3fc9ee28fd88f14ea642552e13 SHA-256: 86b40f9922e9242a52e9801f33ef86f13674fb49013f346ee1e6073f1c782364
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics, including a critical ClamAV detection and a high-confidence ML classifier, indicating malicious intent. It contains embedded JavaScript and a significant number of external URIs, many pointing to compromised WordPress sites and disposable hosting, forming a link farm. The primary attack pattern appears to be phishing or redirection to malicious content, leveraging a network of compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://toromecanicorodeo.com/files/67255241005.pdf In PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ad147ab63---37923733227.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/wiretixawipegalame.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/79155711687.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/laliropapopusubok.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d73e5d94639---33816467990.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/4e7f9a4c8c58c8b8f6df3eb8367dd163/27752148604.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b883361d30e---13136479632.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af74468903---zazasetobuladolobegu.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/57923602150.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/krnuoe14u9l6mdla5vlvr7d881/41377081849.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/9715892176.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/fujezolujibu.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/m0hf48bisr49f752r0ijlf9u8m/bifofipedazugebidizorado.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b55fc66e084---61164418874.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/99965083862.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/28337626906.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/ks26817ulugo9pi11smvkaaqh4/toriwururorekiji.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/teziwavag.pdfIn PDF document text
    • http://flemisterbauldingfamily.com/clients/8/82/82a21d9598fc66f9117a8fb7222c8fd0/File/gozokofiveripa.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/27024063758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+do+you+do+limiting+reactant+problemsPDF 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_off0000e69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69E 11288 bytes
SHA-256: 8f85a1e198150c3bff4320f07c762afcb230b70a92e6a228fbdb7bc6cb3b1157
font_01_sfnt_off000100aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AA 16740 bytes
SHA-256: 725698962165804cb853631f697fce013311bcf84dae4cdc8f2c6930bf745e56
font_02_sfnt_off00012c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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