Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a901fbdacd8dc63…

MALICIOUS

PDF

68.7 KB Created: 2021-09-05 17:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 37506cb93147f86c346e572492c116f4 SHA-1: 69adbd76a3269408dcb2e2f8dba51b3656aa2e86 SHA-256: 5a901fbdacd8dc6395d698f4246e0bf3d5e7ecbe8ad1e5145a1c829bae8fe8ee
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest this is a technique to manipulate search engine results or redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://foundryindia.org/userfiles/file/bukobadikewomorefubupa.pdf In PDF document text
    • http://dylogistics.com/userData/board/file/domugutoj.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/4198863519.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/bc96d6d4492ed971376ee1d64d07625f/70932337116.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/30848259721.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/30136889763.pdfIn PDF document text
    • https://norservis.info/files/files/58113480760.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/44ae9fbbedb230ad16bd5ce3e222bba2/tazitejijamujugililewokim.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/pesupalerujap.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/38665816508.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fd5ce5add---25675685028.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/70417123194.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/luluzo.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/18314812560.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/06df9a81c0dd7428538d258ca48b14fc/75142811675.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/58025977637.pdfIn PDF document text
    • http://cuacuondaiphuc.com/upload/files/19155577606.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/7jt46vl580nhgqveasrhar3oad/90954196126.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/e03190bae71c6fe426e9674facfb4de4/tukigaf.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b07b727a3e2---82147244483.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/55110895177.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dec55be0db---pemapenorunoradusokoxo.pdfIn PDF document text
    • http://beta-rc.com/upload/files/kumodoziruf.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/9603503740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=synonyms+of+oriya+words+pdfPDF 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_off0000afce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCE 10656 bytes
SHA-256: 9840d4647065aa00f1d84ecd5262bb496bedda1a88b44a39ac34447bbfd327b7
font_01_sfnt_off0000c82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82E 14984 bytes
SHA-256: f9f4d559423c8b65e44072f23f72d79ae3c2c78ddba0ce385ecb03dea78fcf6c
font_02_sfnt_off0000ed79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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