Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad37255f1f27bb12…

MALICIOUS

PDF

79.0 KB Created: 2021-09-13 22:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 551f11f473edb7691ca0eb29752499da SHA-1: dd94e078df27ab76df209af3eb999e0967a7c49d SHA-256: ad37255f1f27bb127b84e0f76bf1e190b10aec1747fa906bf2b3d83de452adaa
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals numerous embedded URLs pointing to potentially compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such PDFs to host many links, often with UTM parameters, to manipulate search engine rankings or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3837

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://smidgel.ru/uplcv?utm_term=100+free+followers+trial PDF link annotation
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613033e64d089---33765337316.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/37411899567.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/tivijovif.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/65347469767.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/12/pojezad.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/85578760101.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/womunabarajuboresujudib.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/46001006129.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/49655269709.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/xezezi.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16137ee54b6050---20723451084.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/89087561750.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5c3710831---bijojalalafonovexakojuwa.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/5290049626.pdfIn PDF document text
    • http://hejia-ele.net/upload/85686516954.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/bukotofotowol.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/zozexunif.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/perezaloxipo.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/bidibujizinufux.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/1631317073361174552.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d1792c68a---23518170172.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad5323943c---2143418900.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///lajokutututuwedumev.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16131dc9f6a41e---54176688030.pdfIn PDF document text

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