Malicious PDF — malware analysis report

Static analysis result for SHA-256 316b8f35899d805e…

MALICIOUS

PDF

91.7 KB Created: 2021-06-26 01:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b463d347b97b8d163895ac51a2e06e33 SHA-1: df7e552e88ed0740cd74c52d0134a1b8fe3da276 SHA-256: 316b8f35899d805ed457c8b9d2ac5f4e959c8314f28b27697fd25b704465c954
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to these compromised sites. The file's structure suggests it's designed as a link farm to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160740bed7a614---rejaw.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/latafuberuz.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/a5b5c95a512fb3763f2500d3fa62e4f6/sidapuduzagomizuwomixim.pdf
    • https://alajuusa.eemedia/contents/file/nebazibepanewadotodabig.pdf
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/46605844863.pdf
    • http://brianhaymore.com/images/e/file/45642794439.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/3e688034115f8412a22e6ec88828e6ef/jijumuruxovajakatawim.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073295a3ad05---nizixipulepujonikugevezux.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16089b1d0c05a6---siwexefezakuvupisubizenej.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/a284d3a5400e70d690f5a373139fbaa6/89622480983.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/batekodutewuzapiwixi.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/793f55cc6fd5a4d00583787ab6dcc289/78093099605.pdf
    • http://telmeed.com/web/ckfinder/userfiles/files/69875330045.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b61278d4f---xawepo.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a626e38d20f---tulanetajijijer.pdf
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/lakus.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b269fb00274---potonit.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/25a3da8b8f7487c9f6201575bf7b3c6d/dafozudijafawogufiwi.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160722720a72a0---98875981686.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=god+bless+to+baby
    • 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_off0001022e.bin
67b6024b97eb81df55018db9b9cbdce6d3ec6d269c25a3b5ea088896721c666f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1022E 10240 bytes
font_01_sfnt_off00011961.bin
e25e6f10b75afdb03ff8a8052d6f6140fe29f7b55862d22d63b23aabfabaf3da
pdf-font-stream PDF embedded font (sfnt) at offset 0x11961 18052 bytes
font_02_sfnt_off0001489a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1489A 16792 bytes