Malicious PDF — malware analysis report

Static analysis result for SHA-256 db73d529cb6870bf…

MALICIOUS

PDF

67.9 KB Created: 2021-09-24 02:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7699802ba99877ea1f590b48f5048fe SHA-1: cf083021b54b4d3a6b7523d038d9e13ac9bb528d SHA-256: db73d529cb6870bf5cddd1d285f5410b74d78738c08d1aabc959b662f6316a41
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The document also features a large number of external links, many hosted on disposable domains or compromised WordPress sites, suggesting a link farm designed to obscure the ultimate destination or distribute payloads. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5925

Heuristics 5

  • 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
  • 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://cructi.ru/uplcv?utm_term=how+to+draw+on+a+pdf+on+mac
    • http://sunil.kr/uploadfile/fckeditor/file/79520436674.pdf
    • http://twilaw.com/files/files/96652968223.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/65060iik5h4dne0l6vhbtbgde0/76810266520.pdf
    • http://karinameal.com/imgdish/files/puwijas.pdf
    • https://noddy.nu/images/file/9666670950.pdf
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210915191139.pdf
    • http://limeitec.com/upfiles/editor/files/xurididiwujoxusorijodore.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/39d75084c33d15f5d252b6841d024a45/44241749540.pdf
    • http://esipro.fr/userfiles/file/narizu.pdf
    • https://balajitutorial.com/admin/userfiles/file/72620015531.pdf
    • http://federicozucchettiarchitetto.eu/userfiles/files/diwudi.pdf
    • http://komputerzagrosze.pl/userfiles/file/94903514808.pdf
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/pobaweruroxepuwapuxido.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/9bcc0db36d67405aef09ba3799fe11f0/30384902723.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c5ebe86c88---73859682735.pdf
    • https://egokituz.eus/files/galeria/files/riletate.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145da1b7f710---surazolik.pdf
    • http://plusk-car.com/js/upload/files/lajatupumotoxeligupoju.pdf
    • https://vietrocknet.org/app/webroot/img/files/36012182472.pdf
    • http://sun-green.be/ckfinder/userfiles/files/lisafufinarus.pdf
    • http://al-bandak.com/userfiles/file/77272547288.pdf
    • http://ncdesign.it/userfiles/files/46624007907.pdf
    • https://riondene.ch/img/uploads/file/mivajarokexorirugikogo.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161464bd2b145f---2813038638.pdf
    • http://themetamorphoseprogram.com/userfiles/file/fepepinoxeduguwese.pdf
    • 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_off0000b7fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FE 16792 bytes
font_01_sfnt_off0000d015.bin
c1cb6e911f22fd0eb51f19b5c51d87ef049028ab1119aed7e3acb713cf882077		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD015 10420 bytes
font_02_sfnt_off0000e7a9.bin
5ee48faa2fc25a22ca37dd0fd68c10da210f772dce72926d97357d09387b4115		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A9 16272 bytes

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