Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef8610e212ce096…

MALICIOUS

PDF

77.6 KB Created: 2021-09-01 15:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d7ad83e0f40dfee17b84f16660eebb0d SHA-1: fc8b6f5459ad7bf7251685864f166685c6383ed6 SHA-256: 6ef8610e212ce096cded911c093d2392d14ab710bdf7f252230f0681f0c185a0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and link farm behavior align with techniques used to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/f6me44vn9vn046cg0jgignumhj/xowaj.pdf In PDF document text
    • http://notarbrazda.cz/userfiles/file/32117527373.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/bb298f55261fb088f30268c187823661/67557317549.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6e9bcfbf82287b281f25fc54f728026d/dogubenexosutoz.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/48232505820.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/10412426296.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202108162117323488.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16129c2b7c4511---98397617612.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c2ba001dc59cfa3ca9be5021c3aadcef/dapitovadalisiwedo.pdfIn PDF document text
    • https://area5srl.it/file/falenuwikilugefosene.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/85898687386.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16095bff3e414e---60959175147.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4efcfee1cb---bonapasafozodemamomisewub.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/76217216633.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/17830938381.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/ec62226349932641592f1520fac8c9b6/novelawilikajib.pdfIn PDF document text
    • https://buyafranchise.org/files/files/livewebipirokodotafux.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/xigafu.pdfIn PDF document text
    • https://parfumzone.ro/files/file/digariletinorekewekewijep.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de3d5ea02d---29280346593.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021071705494089.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaae1b3acfa---xepavubulanelovapava.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/zesiwetoruxudaparatenu.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/fdb0e0a1cc54a12a249876e8a274bea1/feduwiji.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/9355630186.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/54355010379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=infinity+sign+textPDF 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_off0000c8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AF 18484 bytes
SHA-256: fd1bb1457c894efe6c92555385a517d3a8620b78eb3763747e60a12bdc056c1a
font_01_sfnt_off0000f8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AA 10128 bytes
SHA-256: 01dccca1c8c71b304b108053fa30935d6c9a777c86e293b53413eab967ada46e
font_02_sfnt_off00010f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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