Malicious PDF — malware analysis report

Static analysis result for SHA-256 832f3d737cae2c76…

MALICIOUS

PDF

120.7 KB Created: 2021-10-05 17:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: efd98bfeaad4df83be7325253ca886f1 SHA-1: 9d6fe0b61791d643e8a13012e82a7f42a179194b SHA-256: 832f3d737cae2c769cff8cb9d36209805276b682fa0dc23ec9fd0066d5e9d760
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. The presence of a link farm on compromised CMS upload storage suggests an attempt to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6624

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=ethnic+diversity+definition+geography PDF link annotation
    • http://giadinhlaurenso.org/upload/files/xovejeki.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161544d0e4d931---86304743112.pdfIn PDF document text
    • http://khocabien.com/uploads/files/77790309565.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/52918448358.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9934d0dd5---fibesarapuxonu.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/10275050155.pdfIn PDF document text
    • http://savemaxint.com/files/file/74601033640.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/705934581.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/46334967064.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/39328498929.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/27931346418.pdfIn PDF document text
    • https://sainaudit.mn/File/64769354349.pdfIn PDF document text
    • http://portableandcool.com/files/files/bufosinegomip.pdfIn PDF document text
    • http://rld-carbon.com/file/bozumufe.pdfIn PDF document text
    • http://jecoexports.com/ckfinder/userfiles/files/20883804762.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-6/20210906022137892175.pdfIn PDF document text
    • http://fabtur.ru/upload/files/70672406139.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/xidekazugugivirura.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/67483772418.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/zazat.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/76739097531.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/gdgkfm0p2qkcnnfodo5cefv6n2/80789035302.pdfIn PDF document text
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/20312391707.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/fulipuluratode.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_off00019a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A85 23104 bytes
SHA-256: 0c63c93851b0b952215c5ba72e2b8379393bfac09f5577e944197fa994cf4116

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