Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ad90d0ec1304fcb…

MALICIOUS

PDF

63.7 KB Created: 2021-06-11 03:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6063d03016a9bd8f64fa0afefd991134 SHA-1: d9c9da2f19a01bdd609af7c5faf68ad0631a6c0b SHA-256: 9ad90d0ec1304fcba99cce0250b98b9a56874ba49bdcefe4e529a8b5e02d0ffc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9745

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://huntic.ru/uplcv?utm_term=editable+pdf+converter PDF link annotation
    • https://afayl.com/userfiles/file/63116347874.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/628be82ae69e8496c75cddceb95665ad.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/48631763431.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/dc0d2d73a90c16bfc02cfc3b9a395b46/97082384883.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210611074646_33673830.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ddec0a1cb---joloxobanezifumexovojosid.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/45044158752.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/21715977252.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebaf4acd90---nugizilufikuve.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/a0ff93c7b6fdbbb33d3df910f85b9eed/widepujakovabi.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17ae7742cc---xuwufarifosapo.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/19009f43e350be48d25fae27290519df/31101139326.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/31222873913.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210515162529.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/bqaqctf56pri9loue357qhk1ug/30312720646.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_off0000e787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE787 5128 bytes
SHA-256: b76305978d61bfec21644eab3a20bbf003afdad426760e62e0252065cc0b5476

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