Malicious PDF — malware analysis report

Static analysis result for SHA-256 257ed4356e8d6bb8…

MALICIOUS

PDF

42.9 KB Created: 2021-06-09 05:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3bf028c423e416048e6f4592216180ca SHA-1: 2369666adb287ff4e1469ccf037c84657a7eae2d SHA-256: 257ed4356e8d6bb8cf5407a44387a033d039fb3ce7f18fce4031df14911e9725
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to PDF creation and a search term, reinforcing the lure of a free download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8113

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://cructi.ru/uplcv?utm_term=mathematical+physics+by+bd+gupta+pdf+free+download PDF link annotation
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aabdf512648---52047660271.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160780954787ae---lelewujatogezeruwezow.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/300720d066a47bbfc0413ef05df69ed1/31241378767.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/5308678119.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/ecfb8b4a38c6daa895f138517dff2e9f/31996387901.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a66b7aaa3e---3797046498.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/kinigadugovomuwizuminar.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/14640443450.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a32f35db7d---57246144536.pdfIn PDF document text
    • http://valeneighbors.com/userimages/9517500719.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/fibigapitelubewemomedex.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b855140e849---sobanaf.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/hmpo2k6q7es28e0amvt9frlm82/nivobufibijazuvoxofake.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/t95lt9nfnnepjt6ssteq0f915j/43294584522.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf960969c7b---matovewifuletononixuwufiv.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/1564536633.pdfIn PDF document text

Related samples 8

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