Malicious PDF — malware analysis report

Static analysis result for SHA-256 90eb99dae82a88df…

MALICIOUS

PDF

82.3 KB Created: 2021-09-11 13:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ababec6b1f72c8e0ba61800e2c5d17c3 SHA-1: 6620284d6a7da690f6a28a5720dc75279b865fe2 SHA-256: 90eb99dae82a88dfef79b5bc5e1b6211133e7dd5717eb97580b5c07fd1a44bc5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://leinerpakgelatine.com/survey/userfiles/files/roxag.pdf
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/rinipijowo.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317bda38411---93917440234.pdf
    • http://wwstationery.com/files/file/nesabefupefe.pdf
    • http://massageindex.nl/images/uploads/74362118577.pdf
    • http://interroadholland.nl/userfiles/file/gixujinedejorip.pdf
    • http://pk.mo/userfiles/file/toxebijutanavife.pdf
    • http://alhouti.com/userfiles/file/bonumed.pdf
    • https://promtour-rural.ro/userfiles/file/nodoki.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613378a955880---wawelokokofokeb.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/fa15cc54a2ede9ed07acc1626e293eba/salujagijiposaf.pdf
    • https://full-flavors.com/img/Data/file/zupolivufawaroki.pdf
    • http://thamcohoaian.com/webroot/img/files/81488709313.pdf
    • https://smilaxlabs.com/userfiles/files/pekojalajaduve.pdf
    • https://ntc-container.com/upload/files/32349812391.pdf
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/86620136827.pdf
    • http://open.ua/uploads/ckeditor/files/zasadunorug.pdf
    • https://bimore.vn/webroot/img/files/safezabosi.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613036f749f70---53015541760.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/9c13e2a82ac8b4c676745eb371ccf124/55312686765.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137dd2e41c76---zonulesexokonalumali.pdf
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/zobojijozuduvasigobejadez.pdf
    • http://indecomavo.pl/userimg/inc/69388139790.pdf
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/vupofenubakujivijon.pdf
    • http://tl-maskinfabrik.dk/userfiles/file/wixuxigesetavaz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=talking+tom+hero+dash+hack+apk
    • 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_off0000dcc1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC1 16792 bytes
font_01_sfnt_off0000f4d8.bin
3a11bfcf5f0f009a5cdbbf4d9978ad4829b5bafdb2f7609b9d4b2dd6c3f3d5c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D8 11016 bytes
font_02_sfnt_off00010e0c.bin
6d6a707aa0ecc4cc2c451df0e63aec72079a24e0f60abbe6cf98004410e8efe8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0C 17152 bytes