Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b6d0d7ef94f8af…

MALICIOUS

PDF

64.0 KB Created: 2021-09-11 02:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 787e2dad8aa2b1c2724898d585c6c3ce SHA-1: cf5c06f740883f325d8bd9a40868b1cb49a59aa2 SHA-256: c8b6d0d7ef94f8af55326068a6a186a77bdb045efd0ea47b0f6cba89dcc00e4b
162 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6045

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=fake+gpu+android+no+root PDF link annotation
    • http://verypool.cn/images/upload/File/8015091415.pdfIn PDF document text
    • http://arsvet.ru/img/upload/wufaguveviretokevisibefo.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/zuzojerawatusariliruxoti.pdfIn PDF document text
    • http://dhf-china.com/d/files/41295214170.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/77216068552.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613265f5d54b8---xokusuv.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/wazomogigusupadudik.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/57871237234.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/26349832351.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a89faaa943---fukegepiwezibedinepu.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/tugisigaju.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/15269759418.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/zusowitemoliposojez.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f63c373104---47531424732.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/21139986586.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/27880032061.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613443a196fca---lisivuzo.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/kikukejejuzo.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/fovadovi.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/54261253644.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/36231650158.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/zexavifodeto.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/mifusevakitonowogape.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/12189645473.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16138aabb2d59d---xinefisovi.pdfIn PDF document text

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