Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac61c72af298c58…

MALICIOUS

PDF

87.7 KB Created: 2021-06-26 07:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 948317a6045133f89f4fd3b0531faeec SHA-1: e54170371d9cd35a0dcd973886903d9878c0f11e SHA-256: 4ac61c72af298c587055e00fb491dd240a35112f2000ba0a24a215228f9966be
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://drafthe.ru/uplcv?utm_term=creative+advertising+agency
    • http://londonjip.com/userData/board/file/75135680355.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f31a90c5e8---34573197758.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818deea67ad---25523684724.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/u6vrcgh7qdmcmnqtff7ajdo4e4/naponito.pdf
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/pvukr75de0fliend5djkj0teg0/6629845342.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aeeb217a7a5---42877844690.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/c86ccf96dcb838c3adc5a27d1a726228/pufukojuzewusuvabawokake.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/aa6911fc8c30e5ef80b7773071c31246/70720428162.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608669341344f---46223735811.pdf
    • http://astro2sphere.com/admin/images/file/feriweposo.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a175d9e57---61323622101.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609891287bbcc---21104154406.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16077ba97202cd---68264394128.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd369d7623f---70139173726.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/2e856cf8072ee8eeb73150f2e6d419c7/wizajumibokesugepa.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/4b642dacf4f0e180750bb60b09a5e6bb/viximolezoris.pdf
    • http://bigsvatcharasith.com/userfiles/file/87971876848.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/64f6978518c573bd2635bedf2ca2848a/gukamikalav.pdf
    • http://kimdaiphatsteel.com/Images_upload/files/10426605921.pdf
    • https://advance-pack.com/editor_upload/file/99854976203.pdf
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/2874823457.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_off0000f418.bin
1e0fcf19ae245a3a62bd96f00172a6bac0fa0f61cfaff0ac9ab4f02ab1e4cdfb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF418 10588 bytes
font_01_sfnt_off00010c3d.bin
12b47edc799a8259e9b441653dd67bc099833cbfdbea60d94d84c349978ea195
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3D 17560 bytes
font_02_sfnt_off000139fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x139FC 16792 bytes