Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e675b5cc6d697c5…

MALICIOUS

PDF

60.9 KB Created: 2021-09-11 11:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 60cc7adca7546507f2d5491467962438 SHA-1: bc35669f445c9c4676061c254e1fb79fe58d6557 SHA-256: 5e675b5cc6d697c5d67db839ff903e94f9bdb5f23a18aa1cf79e8501feaaec46
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further corroborate the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6149

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://coretry.ru/uplcv?utm_term=candy+crush+saga+2020+apk+download PDF link annotation
    • http://ls12368.com/userfiles/file/voliger.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135245bdf2b1---7643179687.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/tumibirako.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/wobavirurojo.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/lapubinosafiwe.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/makatar.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/49366718788.pdfIn PDF document text
    • http://epicridesnepal.com/files/vunajogazi.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/difen.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/teripabe.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/bozujusixolodojinum.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/nupowabeboga.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/85396930353.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/71654550614.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bebe1bd57c---fufasiligimumepugoze.pdfIn PDF document text
    • https://laser123.com/geektic/files/83409133003.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/lagulasixegixebapiluv.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/10428911130.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/87158406189.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///wifagaxubitoruxitatagex.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/69837354230.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/daboxeditenep.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/rududifevu.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161377c2e1dcbb---pajimexulaxite.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/bibowexizavakekukem.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/14392863222.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5C 11136 bytes
SHA-256: e10fafd0ef94834bd935ceffa66e37fcdbf9a37252c326c11632eddc28844673

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