Malicious PDF — malware analysis report

Static analysis result for SHA-256 49e2e96bb46ebddd…

MALICIOUS

PDF

92.2 KB Created: 2021-09-04 22:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 290455edd229233e977aab5fe56c2333 SHA-1: b8af6b0fdaa575ad6ea771f4a4fdaf34f844b7b2 SHA-256: 49e2e96bb46ebddd798f88526df846147fce7af48892c73f50a96d6ccf0e770f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination and evade detection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://aotwresort.info/ckfinder/userfiles/files/bugofevufibebunasexu.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/7t07bjjgl405d156nass5t1dvo/71546442089.pdf
    • http://3bbb.fr/ckeditor/upload/files/gajilifozebulinovumuna.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f4fc1411338---popixakeno.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd0e9836cb---timabafawita.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f6c19d5fa78---14173729526.pdf
    • http://cissi.it/userfiles/files/ranimidemuseparizusuvosav.pdf
    • http://www.pics4us.de/userfiles/file/tajeru.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/l0vld5hmtujoehevi9s1ku16t0/bovezubalimawuno.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0fd1a951ae---55888908619.pdf
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/tudogowugaxu.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/c54867156b95aec424c33ea67ad05395/39629751358.pdf
    • https://www.seblocation.com/ckfinder/userfiles/files/83492743398.pdf
    • http://stolizstekla.ru/userfiles/file/witetomogatifif.pdf
    • https://haltia.mx/sii/ckfinder/userfiles/files/62458783998.pdf
    • http://lenosada.sk/editor_uploads/files/deliwuxapekadadupujux.pdf
    • http://garmagostaran.com/Upload/file/dojuxowug.pdf
    • http://phuquytravel.com/nguyenvanlinh/files/94851069357.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/arnso58rmsi5pop1jmq3c94g27/57422216641.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9a3496305---giruxekisujebox.pdf
    • http://www.cavice.fi/tiedostot/files/13957487649.pdf
    • https://faceless.me/userfiles/files/lobojefelapolikumo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=kambrook+aspire+espresso+maker+manual
    • 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_off00010374.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10374 16792 bytes
font_01_sfnt_off00011b8b.bin
6a4beeda9358e36ec188ff7ccdcd925a2a249af3ac9377a51f2b5ddff83a891c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8B 10640 bytes
font_02_sfnt_off00013398.bin
963172b2bacadf8faa7e98d5c186c8eb56432dc11171dd02b17d3df309783773
pdf-font-stream PDF embedded font (sfnt) at offset 0x13398 18464 bytes