Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5c507063bf615e…

MALICIOUS

PDF

51.5 KB Created: 2021-08-27 20:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 20690c2d7e4ab3c74b6e85f6a8d12370 SHA-1: e3cd3796637a5d1048be0fdd84093c3b26c7cef6 SHA-256: db5c507063bf615e8c438de27a20f9619a0d2567185ab72d4158bb02cbf82478
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to download further payloads. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8671

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=trivia+with+answers+easy PDF link annotation
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606da453db799---89689298515.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/7171132484.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/b85fba9b60d19f6fedbcb581631fc248/51796575035.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/qc51ct083tr4gr078rtq3iju5i/nusuwirafotura.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f65919712---bawemazubid.pdfIn PDF document text
    • https://lasanisports.com/files/64055660649.pdfIn PDF document text
    • http://mp-journal.com/media/file/ruwugiziwopor.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/fokureri.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/1ff00c8ccd782dcd451b3b47ad6255b8/83162079564.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/raretab.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/60759431196.pdfIn PDF document text
    • http://whs1979.net/clients/65916/File/29358614679.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6625758b9f---wodifa.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210519162139244215.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/74328494145.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d19ee615393cffadd8d426be454b942c/23436612524.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/66241783294.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57816ac5e9---967094529.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210820170643601.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/1b5795d4471fee44d778b225ed6d2c64/tesowuvawasef.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/51950348566.pdfIn PDF document text
    • http://raczcsalad.hu/files/58561026750.pdfIn PDF document text

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