Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4cd46ef1f1527fa…

MALICIOUS

PDF

60.9 KB Created: 2021-09-07 21:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4157e98b07c5bb67c49e6a82bd16af52 SHA-1: 79f925e4d97bad2d15a882a1fcec2c933b52916d SHA-256: b4cd46ef1f1527fa8600545c71359404fa19ba1300c86b5a6492b5ec1bbcb628
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external resources, likely to download further malicious content or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8198

Heuristics 5

  • 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
  • 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://crewmak.ru/uplcv?utm_term=chicago+manual+of+style+research+paper+template PDF link annotation
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/pa3pplc2i9ujm656e8li6csf98/zojog.pdfIn PDF document text
    • https://wangwangcamp.com/uploads//files/202108071557225296.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/fabate.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/43793288671.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e75e257ca47---burubug.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/67050159770.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/dopunagok.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/a57321e36ab2ea2c857c360644f9b9d6/35413572781.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acbb07b1e3---37494248803.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ad9e0f0bf---30570129674.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609b99dba86d6---78963497856.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/jugusiresawivagunosa.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/33076485017.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/xonusenuzoditag.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/2725183170.pdfIn PDF document text
    • http://phillipsbricksalumni.com/clients/56168/File/15856746511.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/1e148047b0c82a2ef97fe34ae022e093/nepaf.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/tigeraduwaronolakilanewaz.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/dagorumolido.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/piler.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/agfc748ueta6qj3imqdr15u9jm/zepigemoxe.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee715060c75---96073861649.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/zelovudative.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB585 14916 bytes
SHA-256: 2e5a3de9396316887e48650d76b33c221254b6802ab33bdd9e8e315d4b2afd1c
font_01_sfnt_off0000db21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB21 11172 bytes
SHA-256: 9eeec8cefd3b98bc0bb06044a237eff35f053687c7be5759ba836cb1be0e06d6