Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cbbe8f15cc0fa65…

MALICIOUS

PDF

100.3 KB Created: 2021-09-20 08:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b566a4539d26a7aa096627f5ce5ada6f SHA-1: 231116be3b891e72b7f86a9d2ae48156a384b045 SHA-256: 3cbbe8f15cc0fa6590aa5e6cf13c6708d05ad17b4ade11352b7e5a417a4f6c0a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample contains embedded JavaScript and numerous links to external resources, many of which point to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect the user to a phishing site or download a second-stage payload. The embedded JavaScript is likely used to facilitate the redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://jagamimpi.net/contents/files/gigimiwikuzukegexetesa.pdf In PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/41kn7553ukuibq2ggdfral5se6/4662884111.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210920061015.pdfIn PDF document text
    • https://deverfgrossiercms.deindrukdemo.nl/upload/files/29602186671.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210918022234.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9df1b6a05---noxuzivexoz.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/pokotereb.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5e2e9e5de---41027953644.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/rovofajafajepi.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109140813157619.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/31741494546.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/tutajarimo.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/bufikusuxumunabed.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/ditoteginujivaxowijuwopi.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109190558123835.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/95753933870.pdfIn PDF document text
    • https://laser123.com/geektic/files/punar.pdfIn PDF document text
    • https://guruvinodji.com/Userfiles/file/15810611299.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/mokebilivuj.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/zireketusitovikurilogelok.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/30029190080.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/19545650614.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/xiwexamumuxinulereludo.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-19/20210919190512254608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=watch+jason+bourne+freePDF link annotation
    • 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_off00012277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12277 10660 bytes
SHA-256: e18fc504961096039590c06ca78fa2eb02e89a3dcdb93806df5e5e1c74268f03
font_01_sfnt_off00013ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE6 18600 bytes
SHA-256: 63622e28af205b0df0a208fc7cd6c8112df3af0d8f4577590de27aef54bcb1d0
font_02_sfnt_off00016b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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