Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb35a591b2f9ec0e…

MALICIOUS

PDF

88.2 KB Created: 2021-06-28 23:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a26402fc2511b5b03bb51d03dfece606 SHA-1: 8ee6d635e596d32f1e8de8a02e75efc61fe02ddd SHA-256: eb35a591b2f9ec0e24c2194b41fe027265885dd759d850f1dc8d0e7e38345e7b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to exploiting users through these links. No scripts were extracted, but the structure and URL analysis point to a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://chcial.ru/uplcv?utm_term=brand+quiz+questions+and+answers
    • http://atomleasing.ru/media/File/pediwapoworagi.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078ded270d7b---95422013919.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089268ab98b3---wosunulijuv.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073b38816308---gatiduj.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f77ba92bc---53618241790.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/adb9a1cc886e65af202d1b4efc5046e5/sagodabaxalezade.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/ef2b92d269ac434191c7bd4704354d35/renubotimifonali.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822e848c100---57217481898.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609884b62c7ac---zapaxu.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095db240b4b5---fofaguwojiduvatigosebuva.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/9b3cl15qij8gcse3k0ffsecma1/60519726599.pdf
    • http://ahcxdq.com/uploads/file/091455126723.pdf
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/181837544092.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/9653fb07acb2354b0e03e741ffb39bc1/dugofinumovapebetumigib.pdf
    • https://icbacademy.com/upload/files/geveluwawin.pdf
    • http://www.urbanwaterways.info/files/4811406532.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736e501233e---85470726868.pdf
    • http://sethhukumchandschool.com/userfiles/file/kukakogiropixijo.pdf
    • https://marathonroller.com/userfiles/files/vabugug.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094476f7802c---61636816074.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/fd54141cfb7044965e446ab0cbc67b49/terutojufab.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3f6b0170eef8e366856db184e0602c6b/zozopaxo.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/d8836d58833314a5679e9f383c7956b5/66941852045.pdf
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/magujokexafejoraguf.pdf
    • https://rts-wm.com/ckfinder/userfiles/files/wanadimakazegoxomi.pdf
    • 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_off0000f496.bin
4982cd51d4bea0e979d129860758d7f5ba62b3ae3ce0b1a43a721597bb5ada84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF496 10640 bytes
font_01_sfnt_off00010d00.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D00 16792 bytes
font_02_sfnt_off00012512.bin
eee1ca7ee88166f4865b63af18d24648badeb121fd4bd685b6a612aafa276d9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12512 17856 bytes

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