Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd612611f89b355…

MALICIOUS

PDF

242.0 KB Created: 2021-08-16 03:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5ab52dcb1b0c484f55353f5dee43778a SHA-1: 1f3520cb75d161822ac7cd66f9cb23aff62b0459 SHA-256: 3cd612611f89b355671d6e3da52511bab5a07ee5b8c830d5d3bf2d1f1d37c870
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, a common tactic for distributing malware. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, suggesting a multi-stage attack. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8686

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://agro-vostok.ru/userfiles/file/21252805664.pdf In PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/ludebevemonizobexip.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/087a2b1d49934ea70af7779cb5be9722/sexoverufeni.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/tijumujowekibokodunak.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/xigasosovowul.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17635331160.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/32469150706.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210804_133213.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/0e270dc6fc7824468193561cc21886cf/juwolomagaj.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/fubovunodipipom.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/9acd6b68606b4b94ef8956b07170b35a/lewup.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/dunotenapefajerevof.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/5aa2f2e837346d257a7601c4e7d659b1/wosujodibaxivoletas.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071740556f20---75126872563.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/begamebe.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bb3939a28---73613882245.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16102fa6405d9e---27447675846.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/80feb6769d80a3b7cbacefcd0bdf0c4b/88747886492.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879efe780b1---rarem.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608021cceb802---47276515031.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/18075232389.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/19a27b0ceb67ad99c248c2f769776e30/65571276254.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f21d9060918---kubowiwufigaba.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f7d19731ca4---pagakopaposutasusedebure.pdfIn PDF document text
    • https://actor-conseil.com/files/file/85335075006.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=imagenes+de+las+placas+tectonicas+del+mundo+para+colorearPDF 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_off000351c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x351C7 19628 bytes
SHA-256: 62b739628d8df0b0aa3f2b8062fe4a58a9226004d079ad7d65d6b17a93b15b29
font_01_sfnt_off00038479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x38479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00039c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x39C90 10908 bytes
SHA-256: 3a81ef745ece67a14eeeeefa19eecbd7a156901298d523ea25f78fe49999c5b7

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