Malicious PDF — malware analysis report

Static analysis result for SHA-256 718d7f30cecdb187…

MALICIOUS

PDF

56.3 KB Created: 2021-06-08 13:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 261e6669abc0ae5131cc32b7fce3cec9 SHA-1: 5b2b099b98c382bc948665e91dc7adcc315ec29a SHA-256: 718d7f30cecdb187b12cfe920e9297a13b35720f12fbe137b104af89afe23805
162 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage and other disposable hosting. The primary URL suggests a lure for users searching for unit conversions, likely to redirect them to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7086

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://crewmak.ru/uplcv?utm_term=cuanto+es+1+metro+70+centimetros+en+pulgadas PDF link annotation
    • http://sosnovgeo.ru/userfiles/file/90157334464.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070508d5c01a---62819483195.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839ceacdfc4---zunofolanezepave.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/67787414158.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f32353ed9---22257383989.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-7/20210507183918809174.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pcg19gaherk8ubeh1pa5u1dh37/86654166098.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/58752539734.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/tawusiwapuk.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/8bdb74c66a1d4c914598e89bb18f4332/81678665677.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/tosizabodajafo.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/6c6391ca3ecdf17cd178424f519ed83e/sisodinakanuruwe.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/bulunurepib.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4070d5754---48710153294.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa6ccf3c65---40797019301.pdfIn PDF document text

Related samples 8

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