Malicious PDF — malware analysis report

Static analysis result for SHA-256 f222a97f0ba5c10b…

MALICIOUS

PDF

62.4 KB Created: 2021-10-01 05:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 79496d429106586b9371e20df4627e02 SHA-1: 8bb81b8e2d8ed73e9fb167090fd15c84a7f21a72 SHA-256: f222a97f0ba5c10b14d7d152edd1cf7e91e9e4e557908c640015b4ffed45aeed
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, indicating potential for malicious scripting. The document also functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites, which is a common tactic for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5578

Heuristics 6

  • 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
  • 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://conhantaoankhanh.com/webroot/img/files/kuwufafegigepigegowej.pdf In PDF document text
    • http://stellarp.com/userfiles/files/kokibirodonixitugemigugor.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/25898909418.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/58441437295.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/figifos.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16133e15473c7c---wabefodojaruwep.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/c3eeaa37da3d356501680fc70d92f725/49165177052.pdfIn PDF document text
    • http://cartopack.be/Images/file/81712029891.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141baf81a181---xunewila.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/14200448133.pdfIn PDF document text
    • https://izometal.net/mm/file/guzemoxidowaxoreberos.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/mapujosivu.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/gibefuriji.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/31460019196.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/65427218948.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/madozurofaxewaponi.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/dizimomunokakafadon.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210911014721.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/98356289746.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/xigewovokewigerifaju.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/8c01fa94bb8b0c3564e62e5d136cbde9/bofimuwajiwugujixi.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/41402162722.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/femuzevejuvidix.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/2232393787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+is+the+best+gun+in+fortnite+season+6PDF link annotation
    • 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_off0000b24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24D 10848 bytes
SHA-256: 2458a30450b696792491be796c30c8431628b6fa7ed05479f0e5c9f4de417224
font_01_sfnt_off0000cb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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