Malicious PDF — malware analysis report

Static analysis result for SHA-256 b22b9a8288598e21…

MALICIOUS

PDF

79.2 KB Created: 2021-09-18 07:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e0d5816aba7c955ac304937f644f9e3e SHA-1: 67beca7532cae47ed0d8d683953880b76b4e929f SHA-256: b22b9a8288598e218747043c621ebf596d205f1d129b8104fbaf27b5938fb7a3
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134ba21c6471---6499345835.pdf In PDF document text
    • http://axi-hohenstein.de/userfiles/file/bipif.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/3457779679.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614534e760a92---wazesejo.pdfIn PDF document text
    • http://cataga.de/beta/files/file/16913190634.pdfIn PDF document text
    • https://heyratacademy.ir/file/71965107467.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/17477487363.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091320335859.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/mexupajerigikekomow.pdfIn PDF document text
    • https://cakkue.com/contents/files/42197992471.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/logobawakive.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/50246720787.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/c4852dd0cf66ace286a5df84b0cbc85e/65790549406.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141234a92255---66407605967.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141516e728e8---buguverasofub.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135976aa31ec---29190054017.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/jusiwe.pdfIn PDF document text
    • https://2acontractor.it/images/file/rokejew.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161363d76a4aac---nukugasi.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/lapilamisozuwumiburugeta.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/92209474542.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f95b1c739---totamafogerafuzub.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/winosugozufilumijedozufo.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/44878115546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=confirmation+job+acceptance+letter+from+employerPDF 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_off0000d386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD386 10888 bytes
SHA-256: a71392c03eb4cd8fcc5cd74f116452c282d37a69b5e5ce6ee8ace3e545e1b0f0
font_01_sfnt_off0000ec82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC82 16444 bytes
SHA-256: 62541b8d05eb381bedaee6b3bddc110527f3d3a36a80880047e7f4ad344ecb74
font_02_sfnt_off000116e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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