Malicious PDF — malware analysis report

Static analysis result for SHA-256 234a0dc9435d66d3…

MALICIOUS

PDF

96.2 KB Created: 2021-09-07 14:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bc04d6c3e057fb76160c5b8cac2ff1ac SHA-1: 140f691c8496c7995e6ae2d4b3a841741137f04d SHA-256: 234a0dc9435d66d3fb0dedbeecfa2c99e36512e599c918270d4333cbfb0e37e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, 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 delivery. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://queure.ru/uplcv?utm_term=wells+score+pdf PDF link annotation
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c60eada27---xanurilorutakabukuz.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/61499711744.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10658119338.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/22e2c934313806b24600f23850d16d9a/68551009018.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/39817367809.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/5hd8o9kr2scep40p7hfjrvit77/40338415540.pdfIn PDF document text
    • https://bamor.org/userfiles/file/zikevebeziwazejarap.pdfIn PDF document text
    • http://myjacksonfamilyreunion.com/clients/e/e2/e2167ce47089e9b789d53270b7cccc99/File/kasemujawegisosoxufelorad.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/77386374445.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/a8eb60cd0075f0c8fe62ba5d9baf9599/98246315621.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16098542bc01ae---mawujavun.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/802ef783e981c6a5969d38a60746719d/60660799341.pdfIn PDF document text
    • http://harrisonsfamilyreunion.com/clients/62911/File/dixex.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/22650608364.pdfIn PDF document text
    • http://sanmargholidays.com/ckfinder/userfiles/files/dujuditonitivunimevije.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b4adaa00110---6457043429.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/logaxodobobiz.pdfIn PDF document text
    • https://turbooto.vn/upload/files/6457533229.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/s7edl9u9097tcidtpgjevh76v3/gasubenovabezefasak.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/pebuganapumexipu.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/34486885451.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/36352181367.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/36643115427.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/53629536051.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_off00011376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11376 18848 bytes
SHA-256: d9be116fc535bdd9d8bfa7e2505468d4e9b1e2a038cc55201b3b9eeb5c527c63
font_01_sfnt_off0001446d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1446D 10152 bytes
SHA-256: f438f30b34d6ee473872a21533b04e85c8d4ea5a7bae43e0847d7ca99efb905c
font_02_sfnt_off00015b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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