Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53d3224e5f54883…

MALICIOUS

PDF

79.7 KB Created: 2021-07-18 00:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a2e8b1058619a89df3dc5186e1a2617a SHA-1: c4088cd1a8a42b0d5a7fac30067aed5bb3dbc32c SHA-256: b53d3224e5f54883557e25858891151e57eb2a86363c28a7e00e84d8b2a7b9c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is detected as a phishing trojan by ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or redirect users to phishing sites. The presence of these links and the ClamAV detection strongly indicate a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier clean score 0.2139

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://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c97ba56c01b---78509011209.pdf In PDF document text
    • http://school19-zav.ru/userfiles/file/28364212403.pdfIn PDF document text
    • http://metrokentakifinan.com/resimler/files/2891422380.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/xofukeku.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/rarijuxetejemuwumolibolu.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090f6dbc09c9---rugibizazafomiwi.pdfIn PDF document text
    • http://ezibra.pl/upload//file/getutuvo.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/89el6iah3hdf7el6hh8aq8sab7/23143852567.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b7416b6d5---sijuwan.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/49219014227.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/lufifave.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a898a8e4d92---91952436283.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/4077ab27b431c26659eb694f46fc54cb/50554543924.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/55404563531.pdfIn PDF document text
    • http://beiks.info/public/file/dudam.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e673bccd8---13818185959.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608844d3ed984---taniluwidirikisi.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/1331a7df75a8ee36a2488f683e7dcb8c/gararuxe.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/54279361002.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/af2bc19bcb46cc2eb1885277de157e71/wupapapopaseloteje.pdfIn PDF document text
    • http://grossfamilyreunion.com/clients/0/00/00c8ca1d7e0432e0ca4c178cf0a97985/File/88541109124.pdfIn PDF document text
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/sosaz.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d208779421---jetifiriwevaxobetesiwis.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/wugemefakalalogunijuwizen.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/moroxikosetobesuniko.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/jotubelorikuvubinoro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+who+nobody+knows+what+it%27s+likePDF link annotation
    • 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_off0000dcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC6 10676 bytes
SHA-256: db69af0931eb88cb31c980c8ae0f51f08ca82252d3ab78a864a89f8bfde5b0c0
font_01_sfnt_off0000f54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54F 17012 bytes
SHA-256: 303f04b18d4619185caf122366bb7bc9b65d480a8209d1c2cf2a00c4ceb1d66c
font_02_sfnt_off000121c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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