Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c7cd783c162e1e…

MALICIOUS

PDF

47.7 KB Created: 2021-09-06 04:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 704f004d35fcba9c3010f4021e3d28d0 SHA-1: 97b6ecec335ddc5e9d5ac015f4f1df73bd8774af SHA-256: 20c7cd783c162e1e16c73a38f88220534a1be4bba21c2e2ce42fcff961563391
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification confirm its malicious nature. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9450

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://garglob.ru/uplcv?utm_term=perimeter+word+problems+worksheet+algebra+1 PDF link annotation
    • http://tunglamgarden.com/images/fck/file/xuxikapegidug.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/8097716800.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bd3acc5c1---sagomeda.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610c8f4320b4d---vebafowixedozozowofajoliw.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/43972419940.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/44188921014.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160adfc9683293---80547183810.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e4bb61e946b---36363878134.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/9ei8h8rnfbit8s3ofm18okbr1p/viliwaxidinad.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/46075345898.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/bs3l1i3ogc5honhdottmptsjg4/mebozijevi.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f09480d3f---92700577716.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/161083068be1d1---856621443.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/61804142780.pdfIn PDF document text
    • http://change4best.ru/upload/file/8969137362.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/75404800384.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/81545622050.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160879f8cab201---ritigubalapupirupa.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/7087019715.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada090015b7---vokilotedazof.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fab8ee19da0---65208390537.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/e478e6e58695ba2b9e8130217089f5dd/nafitipu.pdfIn PDF document text

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