Malicious PDF — malware analysis report

Static analysis result for SHA-256 f79b0251767afcbc…

MALICIOUS

PDF

62.4 KB Created: 2021-06-06 21:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: de3b6182cadc3f696b0575625454d70d SHA-1: e5a7547b76911b42bfbdb8b42ee487c2e7240c3c SHA-256: f79b0251767afcbc0633e270499704c952bdaad619dbb5024a8dea00d452ce04
154 Risk Score

Malware Insights

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

This PDF file is classified as malicious by ML models and ClamAV, indicating it is a phishing or trojan delivery mechanism. The document contains a link farm with numerous URLs, many pointing to compromised CMS uploads, designed to redirect users to malicious content. The presence of external URIs and link farms suggests an attempt to exploit users through deceptive content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9853

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 https://allytemp.ru/uplcv?utm_term=perineal+massage+tips PDF link annotation
    • http://goref.ru/files/file/nimopobidutuladutosod.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/62352897834.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/wejajumug.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/8gj8335hk0hqgtpj0p5vs90s1l/bavufovezavemoniripelu.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/ebd2e5f93f76ecd0e533c6227701b883/37206551356.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7c0151a9b---witimowonirozebalano.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/548b5eb273301c5e11419cdea36d20a4/genabofalagareronidujowen.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af58ad3f2d8---bozodepovuzikegasi.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a362786ef1d---73747200312.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106031100391894.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5a8631482---xuvijozufejobisoma.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/68b71e14dea4059e43fc661409583fe3/tiwezorewegemul.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb143ab004---7207745028.pdfIn PDF document text
    • http://ahchala.com/img/file/merimusivonirofo.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/6f5cfb792e8252cb3dd7d0fd4a9b900a/kitejobajikonenavaxafes.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/fenidadewetov.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/31000833071.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/10984685593.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C3 5140 bytes
SHA-256: 269de9eb325a4e711c22d24b46c369f171feef8e29631c7afab0989979e2a840

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