Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3ddb25c371c955…

MALICIOUS

PDF

109.4 KB Created: 2021-09-01 23:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: e4e23129fd96182f4e07e528b9d6e225 SHA-1: c8b8bdac8904da573d25c22e06ea5534b94d32c0 SHA-256: 7b3ddb25c371c9551f8bba4eae3e544b951a765b7b658f67a83f800405776ffd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/cb1luseuqgfvri1j4scnso7guo/rirowafepe.pdf In PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/54689100805.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/lksd5fngrnkg5mt5pv9r01d1tp/gamegizow.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161089ff114348---ketomuroxebafo.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/fumajivadidepejigijo.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/wikizeg.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9fcf09e1c---siruvesafotus.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607814c7e3b61---95184034951.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/83814411803.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/danel1hm7at1busdabmuloka49/nowodidogeragoxup.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/kutabusep.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/fa5b1a56fd3ca75f5c849f8efabad889/91676858185.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083aaaf4eceb---669443058.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a53c5f4320d---40262747035.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e62fa996a5830da7d23d8f2e69462e96/49849979610.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/likatinuvudiwe.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/1532402008.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/cf09ac4efef0e33fde7faf78826559ca/8235760293.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d08f3be75---muvixonizabotozutebozeve.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/wegudujedewenaxedevi.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/eqng6ruerb0m3loh1tf0dmo38h/67132797688.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/lupelomi.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/0ff8caece432aaf823049cf579db8249/zuxerubujotunifubawogewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=reach+out+forPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14610 19732 bytes
SHA-256: e021d1923ee3d533d9eba74c769843792f696ed66de21e9c5a13b15efd39ade4
font_01_sfnt_off0001791b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1791B 10168 bytes
SHA-256: 7ef9ea6ca3765405904c523ac20ec44de3cdb2b393c32eff04bae337dbeddd32
font_02_sfnt_off00019007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1