Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9588f798c09f592…

MALICIOUS

PDF

47.6 KB Created: 2021-09-04 21:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b69e8f6393b9a4a587a7acda4e2e7df9 SHA-1: d35cbe5ab57e0831a71871affb3dfdac198fefdb SHA-256: e9588f798c09f592ebe76450e8506f60e0126a3f449fab56d0032fa3535d5e59
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF structure strongly suggest it's part of a phishing campaign, likely using a lure related to 'arduino uno documentation pdf' to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9450

Heuristics 5

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=arduino+uno+documentation+pdf PDF link annotation
    • https://prtl.pl/userfiles/file/kidaputi.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073640111534---mekitebipanubujofanepe.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/qm6nsja39mejebpglacn52hpfb/kilezezososemiluzuvubugo.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610ffb99d7a85---sowovadosaroteliweku.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47351b7f60---97186691129.pdfIn PDF document text
    • http://come2menorca.com/images/file/92414191765.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/xawimawemigizanerodobivis.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce082ac034d---77585841656.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/8892dbe2c388c9512d01658995339699/zigatasemedadavinun.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/32d1680f307d5b0d52862b9940d3a64a/96657981439.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/lopod.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e60dbe97b0---pavilub.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/vefefogimu.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/60832942595.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160822431d8776---54528361605.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/6646351331.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/josaxojofulozove.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/mezugitud.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/31470624821.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/sutamosokemi.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/39518704503.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e35878e92e---82438208689.pdfIn PDF document text

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