Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b3ad484243daf1…

MALICIOUS

PDF

69.4 KB Created: 2021-09-29 01:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f5db8207405df79227cd61bde0d66ef SHA-1: b76ced188da2e93fabe0d1929a7fd60030228a5a SHA-256: e7b3ad484243daf1c57255228f734429a9db50217ac2ab5350d5872bf4b8903b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing pages or download further malware. The embedded JavaScript is a common method for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=last+christmas+vf
    • https://pelletier-tp.fr/ckfinder/userfiles/files/sagodo.pdf
    • http://adice-area.com/pictures/files/97281138455.pdf
    • http://pscemetery.com/userfiles/file/sugiti.pdf
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/gozine.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8c87a4508---57267212186.pdf
    • https://birotex.rs/images/files/13654446586.pdf
    • http://shqinze.net/admin/upimg/file///lewokuzalufowaximituro.pdf
    • http://davcpundri.com/css/file/97116634910.pdf
    • https://ptkas.com/kingkong/userfiles/files/10206162328.pdf
    • http://7sate.com/filespath/files/20210924175952.pdf
    • http://komodovo.ru/upload_picture/24211635703.pdf
    • http://lukoilmarine.com/ckfinder/userfiles/files/15730272673.pdf
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/71425428140.pdf
    • https://study-abroad-travel.com/ckfinder/userfiles/file/kibovulekobujin.pdf
    • http://st-johnson.com/Uploadfiles/files/63920931485.pdf
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/87144855735.pdf
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/velolulinuluzajureluxop.pdf
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/24990409332.pdf
    • http://jeansresource.com/js/ckfinder/userfiles/files/mavinidabi.pdf
    • http://www.eatvirukai.lt/uploads/files/8833598499.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16141f72239e6a---32693665086.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cb0f27b5e5---gezixepefirumevuw.pdf
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/95941352573.pdf
    • http://www.kickcommerce.com/userfiles/file/selamojozugapezune.pdf
    • http://ilink.pl/userfiles/file/sifojije.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_off0000b3c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C2 16792 bytes
font_01_sfnt_off0000cbd9.bin
9e499afde00d6673896f1a4733c86f156e9b274617b0bd8f92f3a00d82b383a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD9 10220 bytes
font_02_sfnt_off0000e2ca.bin
62d69a808afb988de1d5a81c7355a95d2604925abca3662183b174a03137d1fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CA 14864 bytes