Malicious PDF — malware analysis report

Static analysis result for SHA-256 c699fa81aea4ab0d…

MALICIOUS

PDF

127.7 KB Created: 2021-06-10 09:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f522fd3ac7bb5a691efaaf225c38adb6 SHA-1: 59db3114727b5c8c3e05621561b164c02872a4cf SHA-256: c699fa81aea4ab0d56ad8c3d8bc2bdb6c4a9c62753cf60528eadb894d6fbc498
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8786

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://infrive.ru/uplcv?utm_term=optimus+prime+truck+model+name PDF link annotation
    • https://songhong-thudo.com/img/files/zawibamuvomawofofinilesus.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/e5b7d4894c880e1c49311bbc13236f75/5862774080.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608219c7b6bfe---paduwelubemej.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/17606245739.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa75d9c154---97282734522.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/2edc812c8f47dc1b472c33e6c0fbcdd5/zozewokefegawidujewiburiz.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608922d318101---38362865619.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/98qfk0oks5c063ictgvgql2ror/gukiwix.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/nipobubube.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/655df8b0165bd2c5d2349e38728eb9f3/latawozisa.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/17397374958.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/29525246188.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4f112187e---72282572733.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/23390312984668262bd9eacc9f46811b/gopumowapavifiwakasezu.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f79bae0bb9---luvavaxabedusera.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa1bbe6c25---80202145769.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/ef106110ab31a3d10b93eddce63d6a54/50044247779.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/37917950c8241199b9730ec8aa3fb505/26885000106.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B716 4332 bytes
SHA-256: 9da3a8c5225697c5f020f35e1b18e2c0ef199fd46c3ec48569ac63809fb2abef
font_01_sfnt_off0001c65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C65A 5308 bytes
SHA-256: 29ec5f79d706e2f03d77c89844488a6a05253ffa3254f75849d6f2f74e9c422e

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