Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf6b69feb30ccc4…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 16:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4bab37720d94bfe9a5a48eb693034531 SHA-1: 20b269ae664035b666dd4e31b0be431594139352 SHA-256: bcf6b69feb30ccc4622ff1d731754a6ab97ce04ba9aac42cee6cd2bb408b6e92
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is intended for malicious redirection, likely for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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://allytemp.ru/uplcv?utm_term=solve+the+following+quadratic+equation+by+completing+square+method
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/2cd72578427d63d7834c33749dc2ef36/28455886382.pdf
    • http://hongdacable.com/d/files/7813191346.pdf
    • https://mysilo.com/upload/ckfinder/files/57202145341.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a384b33fa4---34367790036.pdf
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/bexakufiwetosigobonoz.pdf
    • http://damvua.com/damvua/public/images/files/supujonaxotitatix.pdf
    • http://baheth24aqari.com/ckfinder/userfiles/files/domejepatataxulas.pdf
    • https://rewaqousha.net/userfiles/files/tajinewapinupupinasa.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab9e941c86---16499239854.pdf
    • https://biographiewerkstatt-singer.de/userfiles/file/jiniweboguga.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afb00f01e5---1839413858.pdf
    • https://metricgroup.it/uploads/file/83303444027.pdf
    • http://abcgsgeds.friendship-match.com/upload/files/rifimexomokeraxetu.pdf
    • http://zsdbiopharm.com/upload/files/jodet.pdf
    • http://itkaufmann.com/images/fckimages/file/tegiweledirosetavad.pdf
    • http://saigonradio.com/userfiles/file/gibinodu.pdf
    • http://goldartline.ua/userfiles/file/vogoxo.pdf
    • http://acecaalcoy.com/userfiles/file/vemovisunubujalot.pdf
    • http://werkschoenenverkoop.nl/images/docman/files/10389971722.pdf
    • http://talk200.com/admin/admin/uploadfiles/file/34907056644.pdf
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/88777454288.pdf
    • http://onsijsselstein.nl/userfiles/files/dasaj.pdf
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/45002653437.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d230.bin
c81b2e8fe41d369b74b8946cece0ba372c3fa8b855d53f256b0adbced8022750		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD230 11792 bytes
font_01_sfnt_off0000ed8a.bin
33001e69abbb2bc73756aa62eed8d51b8c81c0bae578941a4c0d886433fad9cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 18000 bytes
font_02_sfnt_off00011c89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C89 16792 bytes

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