Malicious PDF — malware analysis report

Static analysis result for SHA-256 da637b1e74a65224…

MALICIOUS

PDF

48.8 KB Created: 2021-06-12 05:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5996785482153948fd7aa464a06ebf3b SHA-1: 06706c0602aee9007a2aa0d32333af68f942fc5d SHA-256: da637b1e74a652249ace6daa51389763d7697232dce3c3ae34863fc186d4374f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the presence of multiple compromised URLs is a high-confidence indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7228

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://cructi.ru/uplcv?utm_term=adjectifs+et+pronoms+possessifs+exercices+pdf PDF link annotation
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/875be15c96de4e22fda2e8f1beebe82d/toregemez.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/2113227588.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607237e3c5945---25273847103.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083b3dab2e4d---31099764361.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5007e6146---tirexifasiwefizot.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/919039314fe09de32722e87a962233da/2621004682.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7691b28f---biraxaregonof.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073593d4e733---89229360747.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/91027132030.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/k34lft5l3goh19ip6uuaa0akk2/jibuvigubot.pdfIn PDF document text
    • https://sanidom.pl/img/file/jebavupufomaseteguzo.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076220d2df25.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/2bb95921f605c710f5fad20624a0fe55/40968737398.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160acabd3ac154---86533323193.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/89853319966.pdfIn PDF document text
    • https://datawire.gr/files/files/wakiwupotovowokafilufivir.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/8ab78e9acde553cfc5158ce9ad551771/fazemafekumazi.pdfIn PDF document text
    • http://ridendo.cz/files/file/77711223847.pdfIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

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