Malicious PDF — malware analysis report

Static analysis result for SHA-256 994c4dda91deefc9…

MALICIOUS

PDF

83.8 KB Created: 2021-09-24 02:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d0cb2572593ed1928da08742f9ac819e SHA-1: 7ee2e62739c63d13fd068ac846849746c50ee3fb SHA-256: 994c4dda91deefc917ce2150e741fecf3a4a9b8cb707fe0ed52fe5f8691b5818
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 disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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://drdj.friend-match.com/upload/files/99202940809.pdf In PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/39711115400.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/tulisuteroxujevole.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/rexiwirajevalodemiso.pdfIn PDF document text
    • https://galafrica.actstudio.ro/app/webroot/ckupload/files/galegekubazesag.pdfIn PDF document text
    • http://ipceurope.be/assets/file/12537512539.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/55990229651.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/34192667351.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/3311611802.pdfIn PDF document text
    • https://lederstuhl-shop.de/ckfinder/userfiles/files/96225131936.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/garibimezetigugevapux.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/82519515327.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc21d8a97b---48707858097.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe1fe42d2c---nepojidefebenuniveginok.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1614d0717f1de1---83640013539.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/161600366735.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/supopilakale.pdfIn PDF document text
    • http://slsnn.ru/content/files/85015833963.pdfIn PDF document text
    • http://elpijisystem.com/file/76597673773.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/85490642200.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/vobexi.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/65242983497.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/zexisezifujetagezixib.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210923_72FEDFDE38791A01.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=developer+options+offPDF 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_off0000e41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41C 17892 bytes
SHA-256: c2e8d7fc516785312d1e3c1106cc33dfa4a84c7e9b5ddbdaa58cb407c4010ffb
font_01_sfnt_off000112c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C3 10256 bytes
SHA-256: cfc8aa6936bd2f5afbc38aca457aaf9b141dc33d95dbab191bfef51c25dc6ed6
font_02_sfnt_off000129ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1