Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb80350f58a85b3…

MALICIOUS

PDF

44.2 KB Created: 2021-09-05 13:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 508b0267744ae4e6e4c4e42ca5bae67e SHA-1: 892285ba8f40d49f2ac35f2ff91f5193d7691484 SHA-256: edb80350f58a85b3af92ee8e1d7ba3b479df5c9243e9da6c441dcb26c71dc36a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is classified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content. The primary lure appears to be a fake search result for free PDF downloads, which redirects to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5654

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://infrive.ru/uplcv?utm_term=philosophy+books+in+english+pdf+free+download PDF link annotation
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/74gkldggqlmf75h51uc8dcu7ld/xudebogifitu.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/pepewojoxilotenutija.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/67177239485.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/56304250202.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/26742282412.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/fexawikeradele.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/vatenapazowadabobaban.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/41767425638.pdfIn PDF document text
    • http://araonline.hu/uploads/file/57516831801.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/672ac1965bea0d61b1689229d1d2b3fe/kizunusunowu.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-8-17/20210817134517858975.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071a37e6aa87---jitomiregudilave.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/zasojojitaw.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/kumul.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/bisurokivatitozol.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4ad808d9e---paxikafasawetituk.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737262abc0b---wimipepex.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/0f1fd89047c29fa5ab798ee86e505b76/nelebuxamaxofofokema.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/fifipiwelana.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/fasokoxapefogedizurezebe.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/dediboxokowusododez.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/997230239.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/tozepezokizukanowuzow.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/2299240670.pdfIn PDF document text
    • http://autovoda.ru/upload/files/39003616489.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e513e2af70---befobowurapasawukiferi.pdfIn PDF document text

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