Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a37adf76bc75375…

MALICIOUS

PDF

86.7 KB Created: 2021-07-28 08:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-04
MD5: 701ed7b94778e1eb579275b4b4f275a4 SHA-1: dce66affec28bd8723016b425372ec7b858b0bcb SHA-256: 0a37adf76bc753756aefdac6aa6a7801b50a0c3a99b9e22a94cf7fe932422785
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure itself is heavily obfuscated, and the document body is unreadable, consistent with exploit-laden PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2bf5368ce---jidugujijituxeta.pdf In PDF document text
    • https://ckmusicdesign.nl/userfiles/file/jinolibalepuwadafizitel.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/1c2269b41f953b799661a26ca3cc8fc3/63945424441.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/babalinin.pdfIn PDF document text
    • http://rsst77.ru/upload/files/vusubeselijexigovu.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/11594253363.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210625_194926.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/40713070796.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/75268921151.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b117972ba---15658191850.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758f33b757f---48844785194.pdfIn PDF document text
    • http://hopkim.vn/upload/files/415115081.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/d501324e7fbcd97ca6469e1d6de84844/82912931993.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/91749518804.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210705002922_bg0ubm.pdfIn PDF document text
    • https://jagamimpi.net/contents//files/binoponorebuxezifu.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/2370497329.pdfIn PDF document text
    • http://rapet.hu/files/5663623365.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/0ogdrq2v70erh53j7hkts1avi7/didatevolipufotuletudoji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=plano+de+leitura+da+b%C3%ADblia+ordem+cronologica+pdfPDF 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://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_off0000ec8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8B 18768 bytes
SHA-256: 0e882d902952d6939a57004c346de510b43882be9369608f21da254899485eca
font_01_sfnt_off00011a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2E 11100 bytes
SHA-256: 2a0435a34f2fc0481d08b32d5cf8e69fd828b087fc40b1b93c006cbb2f56c9b1
font_02_sfnt_off00013393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1