Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b35ff236a49fd4…

MALICIOUS

PDF

84.5 KB Created: 2021-06-25 16:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a849bde29e7a3851b65ff0d8b26b80d3 SHA-1: 341a02cb707ba1c1b816e0547b330df17980864b SHA-256: 50b35ff236a49fd4c5fbd900d76cecfcbf4119ed7b251da5f84f5bdc757742cc
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as containing a link farm, with several URLs pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious. The presence of numerous links, many on disposable hosting, strongly suggests an intent to lure users to external malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://rauvuonsach.com/images/uploads/files/sopogobudanojaraz.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092faab5a840---zozemebewojo.pdf
    • http://liffeyartefacts.com/fckimagefile/file/rebeburidulijetalof.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac8ae1b62a---74137184086.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/04bd86a1020252bfd562ad3493afbd64/reridukogimatow.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608698fde21a5---misug.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/ab0139a48419b57371a056f039b28538/63973981969.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/p79jkguage1jeirbqpf486u1sf/punixabixabukufal.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/60b0d0739cb243ec181d200550328f11/mesebubusaj.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/2e5f9fa0f1e6f1193e9ca44805178885/26956147030.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082420b5fa46---pamugo.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/aa74411e7056b7382d278f0c5c5ca642/91561436139.pdf
    • http://studiogiovannone.com/userfiles/files/muzofupumaligetiloweva.pdf
    • http://mobiliteit.nu/files/19961899300.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/0gur5orb9kqsbg6d37rmhf1jm5/34733615569.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=made+easy+notes+ece
    • 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_off0000e838.bin
500d8f21ca5d9f75dbf5c6447d19a2e66c5f5ce1ee14bda6cc959591f44363be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE838 17800 bytes
font_01_sfnt_off000116a4.bin
0bd9cfdd6e62bc2fcc5886ae15030f1be0abad380c72a19b791c913c505b6925		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116A4 10232 bytes
font_02_sfnt_off00012dcd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCD 16792 bytes

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