Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd0917e612d4387…

MALICIOUS

PDF

69.3 KB Created: 2021-09-14 07:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dd5cd473607205596470d192ba663328 SHA-1: 4c7c10fb10adf93b4c33245ad9c1f7e2452e4895 SHA-256: cfd0917e612d438778f30f50e31bc638a425ebf7da741de685b32add1d7f444a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links hosted on compromised WordPress sites. The embedded JavaScript likely facilitates redirection to these malicious sites, aiming to deliver phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://catamma.ru/uplcv?utm_term=network+speed+indicator+android PDF link annotation
    • http://ekorob.pl/userfiles/file/terewonabawoviputuxixat.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/75353795934.pdfIn PDF document text
    • http://happycondo.leaddeehub.com/userfiles/files/kosar.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/godivedabuzimejajamogir.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d0735ea26---51983833012.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/182794414.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/98228717517.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/21274002271.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/84925080926.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/54534789253.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/jijipi.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/18580863239.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/66118181905.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/28590839067.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ec94aa955.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/91542697935.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210912020258.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/kinolovemerejupulubafuj.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/gudigumibitidokazefizapa.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f126fc9a71---68955102101.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///badurinufejuleriwetuzezif.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/rojaledekeresenepivewumi.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/wazufuwufiladem.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E5 14788 bytes
SHA-256: 1177c3380e9387e299fa32fc0cf0ec76be6c811de9bdfc15381c7a81198fef05
font_01_sfnt_off0000d728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD728 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3F 10616 bytes
SHA-256: 5611b4e239d9bc4dd238c321e075c487428faffa06d46cc8c9ce632df60f55df

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