Malicious PDF — malware analysis report

Static analysis result for SHA-256 391eea146943629b…

MALICIOUS

PDF

68.5 KB Created: 2021-09-25 14:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d8e01b236acdb6a02bee5cae4f5fc214 SHA-1: 15327018e9b03260d1f350f1f59954f3c476edbb SHA-256: 391eea146943629ba7bd94b0e73111f8f120d34602bd2c97038cf76ed1c60ff4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, 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 phishing or malware distribution. Although no scripts were directly extracted, the heuristic firings and extensive URL list point towards an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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 https://crysiq.ru/uplcv?utm_term=test+visa+card+number+with+cvv PDF link annotation
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/kefoxagazifiwag.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bawiwovufif.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/953298309.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/kusilesod.pdfIn PDF document text
    • http://chamdure.com/DATA/files/kuvemesan.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136ae2f315a5---68401297126.pdfIn PDF document text
    • https://senfina.top/uploads/files/nexidonupewuve.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/zubila.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/53865731252.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/tiromexe.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/xapebitofaragobaxe.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/tudovesugumazurebavulix.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/juremebopu.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/75b00d79c4a4aaa9126f88998e962599/velujepopiwam.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/20415106374.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/vikunudafu.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/zorewulilejage.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/61157598693.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5c07bb134f345940e930894003ee9bbd/logawuwitopina.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/bezikodutalis.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bac129b59---jipiserapugixusosadi.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/34637423656.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/46064953478.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/71614642297.pdfIn PDF document text
    • 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_off0000af2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2A 14644 bytes
SHA-256: 032b21aa3073e72b98fb42aaf860d38f4c1357256aea9af92d75968aac1a7c6b
font_01_sfnt_off0000d40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC23 10824 bytes
SHA-256: 5374c8dc279d4719cbaed35f5850398cc013cf668193f725a028f4edc8e88114

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