Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e380ad339bb351…

MALICIOUS

PDF

85.9 KB Created: 2021-09-08 04:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 527e61a5cfe1c3de43d167b4ca7ef7aa SHA-1: 20b537db6ac14c765f5ee3485ea91ee1eb179a2e SHA-256: a8e380ad339bb3511656a39d7c318dfbc3673a74e52acb9001c51265a6b42b43
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The file's structure and link farm nature align with techniques used to distribute malware or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8422

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://bassbasement.org/userfiles/file/poxurat.pdf In PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/3o8truprge1tlmkqeitba4tjjd/20547926835.pdfIn PDF document text
    • http://momsystem.ru/public/file/3891302311.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/3cdfaff0c63880fc42cf4ad5d3fb1d85/24497304332.pdfIn PDF document text
    • https://fallsplat.se/file/89359949029.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/9cc9512b430273a07231660f79ce3dc0/77057865823.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/pirujosog.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/72185131203.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/pimowemogegedovejinodu.pdfIn PDF document text
    • http://3asoft.vn/img/files/75656949726.pdfIn PDF document text
    • http://sjhtractor.com/d/files/tiwufeminivuledotub.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/de77d2981d04cc38ce60ebd3e91b4116/dodolazo.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/18850371441.pdfIn PDF document text
    • http://iscelenie.info/files/file/10032437780.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b460664c238---sewiwazojifizalasote.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/485407a69cf3e380639497ad2cb38952/jarudurevapakorawodukus.pdfIn PDF document text
    • http://ridendo.cz/files/file/19748191641.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160bab08ff38e9---jetuzanijirutupavovil.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/94749512695.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/49472543055.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f8cf7c72031c2b839817cb9d2e30c401/29016986312.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/68261358170.pdfIn PDF document text
    • http://ligneus.hu/upload/file/dotonuwawerapomekewagerok.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/nenapupirekamibuvi.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/vivexukilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+nun%27s+priest%27s+tale+full+text+pdfPDF link annotation

Related samples 8

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