Malicious PDF — malware analysis report

Static analysis result for SHA-256 504184f57334ab1f…

MALICIOUS

PDF

88.3 KB Created: 2021-07-01 17:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7502dfd4ad95ab3a0d22ba23dc5a6345 SHA-1: 4021c8131877110269d84423d2461d6d647a3246 SHA-256: 504184f57334ab1f83b8b883e38945500aa85a684fba2f776bd0f93067186062
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous websites, many of which appear to be compromised CMS uploads. The ML classifier strongly indicates maliciousness, and the presence of multiple external URIs suggests an attempt to redirect users to potentially harmful content or for SEO manipulation. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f0be28268---bagubufipiwefevukexid.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec68cf1de0---juwixulisasuguvekavutop.pdf
    • https://iveducentar.com/uploads/assets/file/44452406857.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e55d196f8f---3834440516.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/1en4qaege137gou4gqpq3pjh75/61853243580.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0bdcd7ec8---sejiso.pdf
    • http://tevukasveza.lt/ckfinder/userfiles/files/4060659666.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7572eb307---69603889125.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b02d2b332---96206792468.pdf
    • https://kraftyz.in/ckfinder/userfiles/files/gafux.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb1e9b77c6---velumejugodijirilimeku.pdf
    • https://condominiovillage.com/userfiles/file/48945747553.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e33c41c62a---bevusubowezikev.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/7a1odopvfgv4kqaa7q9ue4e61q/63655700306.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609896fbef319---fodowepek.pdf
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/66275776622.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b22ffd93889---55861573814.pdf
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/d8ag6et79jf7hs41mqvvp742bi/47663515046.pdf
    • http://sosnovgeo.ru/userfiles/file/22950397848.pdf
    • http://botosani.ro/img/uploads/file/sagetajusegakag.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608718c88e01b---romozopimudipulumonofom.pdf
    • http://turnyras.lt/Files/file/nivekinasilasida.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/esu9lh8l0mbd5u06o4oo5paqi3/16524854729.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075943f484a2---29368327872.pdf
    • https://xn--80aaijzh9b.xn--90ae/documents/file/46198957613.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=upper+body+workout+everyday
    • 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_off0000f65e.bin
8d88ac412d02183f7b0e6b266780f073dcbf9416d5d02592a8e31e0e26a07188
pdf-font-stream PDF embedded font (sfnt) at offset 0xF65E 10580 bytes
font_01_sfnt_off00010e80.bin
a3d36b4d924bbf357b03f0cabbc022a10315b8a060e868fd0509e774f2127b77
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E80 17340 bytes
font_02_sfnt_off00013bf3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF3 16792 bytes