Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c60f1f11a967b7e…

MALICIOUS

PDF

82.3 KB Created: 2021-09-12 09:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: faaababe725b6baf3cd6f4c46eb8404e SHA-1: bf3b21820b38f3e77068f0c1042600e13088e708 SHA-256: 6c60f1f11a967b7e785a71349964425f3ef8093fa8cd2c7b59a057c0e9efbe8b
104 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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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://all-vehicle.net/js/upload/files/87985899868.pdf
    • http://thesei.com/
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/69473702537.pdf
    • https://dehayemek.net/upload/ckfinder/files/siretuxiwomiviloza.pdf
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/92809695190.pdf
    • http://escalierdurire.fr/ckfinder/userfiles/files/faxel.pdf
    • http://milkexim.ru/imgeditor/file/guraxuz.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f49d1497d9---8114186748.pdf
    • https://feng-shuiworld.com/userfiles/file/21874883172.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/6msglfl9p2mhl878vndsjj1f67/27174582185.pdf
    • https://hiperaktivite.info/userfiles/files/59773800129.pdf
    • http://virus-safe-zone.com/ckupload/files/vufutafunixojifitibekok.pdf
    • http://seanmore.com/userData/board/file/78071427761.pdf
    • http://norrlandet.se/userfiles/file/34771125309.pdf
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/tojotepezotulegegivagiguk.pdf
    • http://kimwendelldesign.com/ckfinder/userfiles/files/fakavusumajadizikized.pdf
    • http://apothepharma.com/upload/files/zuvekerivover.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161323a8bac358---vakewanuzimizofupatuk.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=onlyfans+videos+download+android
    • 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_off0000da8c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8C 16792 bytes
font_01_sfnt_off0000f29e.bin
548ed33491324c891a1d0d51c552e9e03611d8c9e158052ffe44888a33cce75a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF29E 18912 bytes
font_02_sfnt_off00012328.bin
95eca8eabd39b92e94d145b740eb60937de7f3421f32be0574ccac65189eafa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12328 10540 bytes

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