Malicious PDF — malware analysis report

Static analysis result for SHA-256 502009578d79f6a7…

MALICIOUS

PDF

71.3 KB Created: 2021-10-02 10:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 896a199fa0f5228aa92d3ee5728f969a SHA-1: e69b40350c5dbf8653ef5aae78a16c522de6a5db SHA-256: 502009578d79f6a7772354ed193b47a3ae41e6121556cf037fb3e32a939be3b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The embedded JavaScript likely facilitates redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jupifefukasagaxobut.pdf
    • http://captaincook.hu/userfiles/file/57308321458.pdf
    • http://biogenetec.tw/image/files/20210917_182935.pdf
    • http://winecellarkeeper.com/ckfinder/userfiles/files/2287951919.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/484e5960e5f2f7b8447314a4581c4b97/30656943252.pdf
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/59159508846.pdf
    • http://lasermedia.cn/userfiles/file/sofifi.pdf
    • http://bilafafafa.com/shopadmin/upload/files/97598909954.pdf
    • http://stadion-zarya.ru/ckfinder/userfiles/files/77225289133.pdf
    • http://zamdq.com/filespath/files/20210920114753.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161537fc636b61---57363159000.pdf
    • https://bbpartner.cz/userfiles/file/99022142900.pdf
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/gufezigusoduwoxavadawored.pdf
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/60047389543.pdf
    • http://tayles.com/uploaded/xuvoz.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409b3637eb6---86266470522.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614176d7c6fba---64288186413.pdf
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/84613154762.pdf
    • https://architektor.ru/uploads/file/wikemosoxarej.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/8c0ab2cd09a335309e3b377035c1abd5/gadilalixedufu.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16156ac095790a---60728598573.pdf
    • https://luatkhangthai.vn/upload/fck/file/mosujokugagugerijinapu.pdf
    • http://accessiblevehicleservices.com/userfiles/file/fetobupukim.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161354caf34409---nawolot.pdf
    • http://jpind.pl/userfiles/file/dusanexanusoni.pdf
    • https://leanuslab.com/UserFiles/file/46852197421.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+deep+does+a+trench+need+to+be+for+electrical
    • 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_off0000b33e.bin
76cd50f8ebed2907858fe1044697bc1269b05e91164b0e2ca1b832d64fe35ce5
pdf-font-stream PDF embedded font (sfnt) at offset 0xB33E 10932 bytes
font_01_sfnt_off0000cc41.bin
5badd9d088b28e76fc864796e5c178a2f317ef999e4e42abd01d5992d231ff76
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC41 16920 bytes
font_02_sfnt_off0000f71d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF71D 16792 bytes