Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dd86dd51dd8384b…

MALICIOUS

PDF

81.1 KB Created: 2021-09-03 10:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0b3dba6a81c72568054a249ed6981be7 SHA-1: 272d697843d0415011bdb23c8f62e563736d724a SHA-256: 2dd86dd51dd8384bc61fe7a349921a50936578966c39b89a6595ebc34cbed077
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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://smidgel.ru/uplcv?utm_term=present+perfect+simple+continuous+pdf PDF link annotation
    • https://allmassage.net/upload/file/20210510024611.pdfIn PDF document text
    • https://southafricapools.com/contents/files/xabasivuxuwikedulofugot.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/vawab.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210722134657866227876.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/kalavuxolurenibi.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160748054763a9---lisojukalogisopedetadama.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/81590159353.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/fizeri.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ca648a58---49944986814.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/14320950815.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/78360046328.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/vevumojijorolinulivetin.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/bidamevi.pdfIn PDF document text
    • https://basisnomor.com/contents//files/vowutigurepemudot.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/07v698aed1lah3eudr9r767176/fiduworejivuvogon.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/fexonipezojexikusiro.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/47647736249.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/waxan.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/pizasamiwufedexa.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/mujofosaworel.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/gamixufuzuregore.pdfIn PDF document text
    • http://quaint-house.com/vivajofupevumigijifus.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/79413067394.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8580f00f4e---18966113812.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160716dc022be0---26242404848.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_off0000d830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD830 10720 bytes
SHA-256: 57efe4d33d1c744e817f49e82f79f07062e847f5c1dcc38d23735fb82b85f879
font_01_sfnt_off0000f0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 17708 bytes
SHA-256: 88916c7e886b50e6f42c9314984c3a5297dd910153af44a90c3e7311b187bd5f
font_02_sfnt_off00011e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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