Malicious PDF — malware analysis report

Static analysis result for SHA-256 af940e39349e7a2b…

MALICIOUS

PDF

79.6 KB Created: 2021-09-04 12:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0550f5e1bce9140e1a3a01c39ec2d454 SHA-1: f5689f7a3f0409173327a823a98f8dbcef9dcfd8 SHA-256: af940e39349e7a2bf321e7bc0b96fe8e8679f078a177591cf9f76e98ac00b0f3
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, suggesting it's part of a phishing campaign. The embedded JavaScript likely facilitates the download or execution of a secondary payload. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ud5oecluludvq5f7lgq26rvtf6/wokujipiritazezep.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/579c84ce93baa021125762b138083e59/27083434703.pdf
    • http://shinies.ru/img/lib/file/89798022642.pdf
    • http://dolphinegypt.net/userfiles/file/84741434513.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/415dd381f1eeda4f9ba21b0916462ff8/fufikogojuvofirejubegu.pdf
    • http://jimmartinfamilyreunion.com/clients/35696/File/96618103923.pdf
    • https://samarpanbharat.org/trila/userfiles/file/dowaseloxupanevide.pdf
    • https://fiscconsulting.com/userfiles/file/6342844781.pdf
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/44521346750.pdf
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/8372516178.pdf
    • http://bloomx.com/sites/all/sites/bloomx.com/files/40784334996.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106170257522822.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/malute.pdf
    • http://vimbark.sk/editor_uploads/files/5953560426.pdf
    • http://rioairporttransfer.com/ckfinder/userfiles/files/nawup.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/11cdcde21455aed7151da083f7fc28ed/29609379778.pdf
    • https://istanbulbalbir.com/upload/ckfinder/files/93601996243.pdf
    • https://scavilecis.it/userfiles/file/58456933012.pdf
    • http://megat.pl/uploaded/fck_files/file/22680606309.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa36459339---89404683794.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6bc0fb3312---mabelexokivelavat.pdf
    • https://www.andreivieru.com/ckfinder/userfiles/files/baxejobofobemasin.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/65e990403ef122ac93cbad56996a19f4/94512791062.pdf
    • https://yptea.com/data/fckeditor/files/danus.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=i+love+pdf+to+jpg+online
    • 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_off0000d120.bin
6e7b04b6c2b6688f0d03d8196498e78072647d8356fa7ad45d1d0e2f187bb8d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD120 10388 bytes
font_01_sfnt_off0000e877.bin
83d228fec5d5dea76a9027f363fcbaf9d36a14a5eed7ecbc35903ca23ebb5a74
pdf-font-stream PDF embedded font (sfnt) at offset 0xE877 18656 bytes
font_02_sfnt_off000118c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118C7 16792 bytes