Malicious PDF — malware analysis report

Static analysis result for SHA-256 086f3794203b5ec2…

MALICIOUS

PDF

73.8 KB Created: 2021-09-07 02:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aa1bb51d3e2975c94cc28d59ff217eea SHA-1: 2bc547fe161ebf9ebbba82c6c7fe104e32ec374f SHA-256: 086f3794203b5ec2119323173f86902a260451f635abfc84f8aaa133ba730946
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://whitepurdeespires.com/clients/b/ba/ba703c466af5784ee38134b9d09df413/File/juvagotofikepizix.pdf In PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/qdq15t0fe9b2h3l2k4rfrvg6oi/61791321119.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/gnhrqu3matv0i10ndruuv3jt94/fijizik.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/16189558066.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108db301c978---17771371751.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/jomezuxixerisotuwe.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3d12e13e4---25801141449.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/43669486999.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/nofewalu.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/jidowumu.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202108190720252215.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/doxadimowirokegenemalogu.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/58401902704.pdfIn PDF document text
    • https://lasanisports.com/files/zevopik.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/60236078025.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161044b2615080---konota.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/22498516221.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/bubefobade.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/1511b76ef5219f00f86dc77341a62345/tijoderipivowamef.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/pexomiferulasikute.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/watibaxuriwefomizumazutud.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/wawuwunis.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/44808531409.pdfIn PDF document text
    • http://lovemyskindayspa.com/clients/d/d9/d99ed7cf7cbac978b7326c22a81d1608/File/safalumujamipuburunoguvew.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16073bbd9c751b---18109051361.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/qhn7b59mg3ihn0nqjpm1enff00/kukofumetazis.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/tukukad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=circuit+schematic+symbols+pdfPDF 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_off0000be14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE14 15916 bytes
SHA-256: f195d7b43a505c5c15678b123debefc3ac2bb174798d2089b2c2ab707c4808a0
font_01_sfnt_off0000e6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E9 11168 bytes
SHA-256: cb7899d0cc90c4b82a8ddbb631934e680bb8b5bfaf5bb1527bffb06457817b1f
font_02_sfnt_off000100de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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