Malicious PDF — malware analysis report

Static analysis result for SHA-256 931b2a5722ae3e51…

MALICIOUS

PDF

73.5 KB Created: 2021-09-11 11:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4ea024cbeaefd2478010600b73e5e2e2 SHA-1: 2f78de63ef63e2a5f6ced89537ff5b6079186b0e SHA-256: 931b2a5722ae3e510beded3454b6eda12da93e17f2e513fc97b1c9402bf96108
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external links, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://archism.ru/uplcv?utm_term=black+ops+3+moon+hacker PDF link annotation
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/wavinitupobafifup.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/daremulewoxe.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/sorerudofejulosezenezev.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/ziduboforimaposomo.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/nizosapezegenevawixoxu.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/keren.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/pivugujujeguwezopemiki.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210902_EB9F457BA81FC182.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/lakoregatiwudumalu.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/vozaseta.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/tifegixez.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/ec502b466d6e77af94d2847f6b59afd1/sabuf.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/58554001747.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/30333895207.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/72860542470.pdfIn PDF document text
    • https://breedlife.com/upload/files/mubuwubowelejiwixilero.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/sekodifite.pdfIn PDF document text
    • http://fohow77.ru/upload/file/xarapedafedixoj.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/vetonawanagegel.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/891a4bed6ade8c6d616e117f4ceab742/29543173513.pdfIn PDF document text
    • http://clerus.hu/files/file/manususokewawozu.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/jijijavegexu.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613569efca4e0---30692778876.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/fisobusaxinej.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/wunafovasasoxofodanebuxe.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_off0000be5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD670 16080 bytes
SHA-256: 2ff2313d41ea35e6c9c5eb5ad0ff4b6f65b7052060ca62959095c39e2d27378f
font_02_sfnt_off0000ffcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCD 10768 bytes
SHA-256: f07d7e63d1e043037e896e11f185ccc3f09b2912fa67c16858ede76dbf32b7e6

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