Malicious PDF — malware analysis report

Static analysis result for SHA-256 47a00896d2b2264d…

MALICIOUS

PDF

81.1 KB Created: 2021-08-06 09:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8fbd2d05193fd5a9ef8de14bd6eb2ba3 SHA-1: 81f22a40dacfdee3b60395977672e139a74c4932 SHA-256: 47a00896d2b2264d117af970e30381ea886e7e94030c2f1d3d11df9bcb70ac3a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many hosted on compromised CMS uploads or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 7

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=what+ground+state+electron+configuration+of+oxygen
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/a05ok3a1dssbdsrvbf2f7rier4/87172208660.pdf
    • http://fabtur.ru/upload/files/doxikugujojulelonixasaka.pdf
    • https://addsfly.com/userfiles/file/60435388888.pdf
    • http://adabaskimerkezi.com/upload/file/zarajop.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/971b7458ab347b8d44bee8643f5255d6/zazozavis.pdf
    • https://autoteam.in/ckfinder/userfiles/files/mutojivi.pdf
    • https://cafesca.mx/ckfinder/userfiles/files/xobekukutasunarini.pdf
    • http://dynamic1984.com/user_file/file/wadasadiwuxobunirulula.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086fdf2bb487---66737222731.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fe5b6fcde---49962334903.pdf
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/94308162922.pdf
    • http://mariopresto.pl/userfiles/file/fowavezonekexarakol.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/8fjqa6k6ifq33flempicruno95/zatek.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c7070f9bc---56597597078.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb6d6adcee---nitorelevetis.pdf
    • http://bydnjl.com/userfiles/files/13863515531.pdf
    • http://mitsubishilongbien.vn/images/ckeditor/files/rawurovebukalutorozusazu.pdf
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/pikeredenitobukewatigise.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160706017426fb---regul.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608921144e04d---tamozijazon.pdf
    • http://mynigaoe.com/upload/file/20210621202221.pdf
    • http://aostavet.it/userfiles/files/53879356920.pdf
    • http://capitaloffice.pl/fotki/file/dumolamodukafafaxuj.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160de0d2c06588---dotujotejaluf.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769ae5540f6---8866370872.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31b8ca2421---52595445391.pdf
    • https://cornwallstaffagency.com/userfiles/file/lowifutelakodisemekukete.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/8t7s1032hgci3l7v1rjuee3gph/40927272657.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_off0000d74a.bin
2cf21caac556ac6b31ff126d77a1a19ca0447a77d742f6b7576924de3dee13f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD74A 17064 bytes
font_01_sfnt_off00010417.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10417 16792 bytes
font_02_sfnt_off00011c2e.bin
e3308576fbed07bf83855af1cf7044af50309d2a38a978085fb08cedf643997d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2E 11064 bytes

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