Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb04ba5827d3c785…

MALICIOUS

PDF

95.7 KB Created: 2021-07-20 16:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ebc6c1d950d3a530c0ee90737db06227 SHA-1: b0d1323f178c6a6f20131ed87ae4026d485abe81 SHA-256: cb04ba5827d3c785e86729c8fba9e4c00d1ca3482aeb265b47a1b8fa11fd266c
124 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, suggesting an attempt to obscure the true destination or purpose. The presence of multiple URLs, including one hosted on a compromised WordPress upload directory, strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2938

Heuristics 5

  • 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
  • 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://agriturismolescuderie.eu/userfiles/files/sinametasujepez.pdf In PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdc3fc5035---gojutiketitozew.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/47195555163.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/dlijp8j3p5n9e1nfm4ejhcda29/57858069945.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bbbd3cb3a---vuvovuzogudigiwo.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb41442429d---63577725838.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16078c6c28e98c---20987760749.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/bijomebez.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160befc53e375f---bujokerakowuwu.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/namekukikopugokijumatufiz.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/33d009f7486f15a179e6cf362f444489/tifatexujogiz.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/kokivusizujubulef.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160addc7cca9d3---1283134611.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c429feb7b23---13247457176.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/vigatamoberowituxinusu.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/3993277428.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/ea1f720277bdc1d1793ac0f2998b9cac/47821035522.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d939f0e9b---71586106660.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/08fa6f153899d743cce56bec7ed8f68a/18143976981.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/vgmkkirg5u1ihqc44cbpgogmu0/9388414003.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16083666a7954b---66514396806.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cacabd0e7c---50055180499.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/bodorisalakupugudol.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e889205544---xinipijamefepopid.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/nutirupugelenepafigujazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=charting+by+exception+requiresPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001377f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377F 11240 bytes
SHA-256: d3b2dec2c35188edbf20bbe2f465e75824b70ae01a612b934f6a3d3963d4c73e
font_01_sfnt_off00015166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15166 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1