Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df6c36b9edd2020…

MALICIOUS

PDF

87.7 KB Created: 2021-06-26 20:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 257ada4ac8107ff34705e2c1282b0d3f SHA-1: f6e949c4825da204fc5012f2fc6a2c8c4dc5825f SHA-256: 3df6c36b9edd20200c5a7dd7d7fbf6da659200ba1e55191e8506d1323b87ffab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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=gate+agricultural+engineering+syllabus+2020+pdf+download
    • http://buddhavehicle.com/userfiles/file/zaraganijarakuxa.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7905a8c84a---44680539280.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b28a10bc80b---11837140736.pdf
    • http://firanywiktoria.pl/uploads/editor/file/93500344008.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16079796a57a79---jovovevafifugiwoxapi.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9d4cca529---datibizojetokovejogoko.pdf
    • http://mobydick-band.de/fckdata/file/74761974757.pdf
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/23986499575.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/6c7aa67f0b35f0fabcc11f6083d0538f/xavejijazimerag.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffbfd91beb---dimowuzugulikatopirodime.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a9614ba63fe---78331106006.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716f7833ec6---88245860429.pdf
    • http://bafiti.com/sklep/userfiles/file/23823379063.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/84pnmtvafuhsh2a6eld36b42kj/20181521236.pdf
    • https://soudurelauziere.com/upload/editor/file/pafavovomilerawilefososo.pdf
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/34942908628.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/51d3a9787b8c7343a6d05c8bfe9e5423/74312580718.pdf
    • http://malagi.pl/user-files/fck/file/lonexozazilitorizi.pdf
    • http://xn--49s538bo8ux8c.net/userfiles/file/74339070285.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/8d4cc00d8292afd40aae5a768d981712/kejonitexokupi.pdf
    • http://bogelaipigeon.com/upload/file/xusedapuwibopinawidatinok.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/6c780f366838394f6b116e48b0d81bda/genexegutenezulasivadokon.pdf
    • http://ngocvietbungalow.com/upload/files/jesovobinumedavuf.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_off0000f2a0.bin
57a7ee4406102006046a27f7824befa30aaf260ec6077e9f0c181af426ba72b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A0 11516 bytes
font_01_sfnt_off00010dba.bin
dfd5c8d7af4520b2db61236a7cb720ac3e7465779c0525b1f769232574d62151
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBA 16728 bytes
font_02_sfnt_off000138fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138FA 16792 bytes