Malicious PDF — malware analysis report

Static analysis result for SHA-256 e14ee6e3fefd5044…

MALICIOUS

PDF

75.8 KB Created: 2021-09-01 17:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: afd6d048d6b711a88993a7f99b4d1eb3 SHA-1: f6ec9346973e7d42a1166315464dd34fbbb1d920 SHA-256: e14ee6e3fefd5044bc61ba863fcfc718fa1268ee3672091b143842c49e29669c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The PDF also contains numerous external URIs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=o+henry+gift+of+the+magi+pdf PDF link annotation
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161151afb93139---27066462882.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/7h0d8qs6cp18ncegnhnl3fff8e/xorimefajutodorawojube.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098419cabc3a---lozazejikotajox.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/fu5nt2helkvj43gfqm9g65dkqu/31073169388.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/3300135938.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6dfe4c5ac---78910134881.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/86747219784.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804678632cd---tuvemixamopetewevilureje.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/wokopibibizubumipuriv.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210805_507A27700E2ACF41.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/zikekeluzewasezalomatow.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/f093c710fa2e80f412695b85b1daf371/losejebelixabasijodivig.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/vuvoduxofepalini.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/sokevanokejavarenenijexus.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/gazazikikewu.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/28762768095.pdfIn PDF document text
    • http://iphysiology.ru/upload/xupokorokewidegimakufa.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/97884648745.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/mazesusax.pdfIn PDF document text
    • https://nistd.in/userfiles/file/98143975892.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/lijivojopifu.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a10847e594927a7286be7102ba94448c/75800864391.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/69084049392.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080989cd004d---tetivesaxesitapawokejewud.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/xakiwamadidojejuwunipore.pdfIn PDF document text
    • 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_off0000c5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EF 10868 bytes
SHA-256: 7dbd0f6b6b535b77a77920028ebcc271981f58ad0e9addd610e15b837cf381b3
font_01_sfnt_off0000deaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C1 16032 bytes
SHA-256: 86feeae99e19ed3a77eacceeaf0e240d5be49a3137599237720579034d664c80

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