Malicious PDF — malware analysis report

Static analysis result for SHA-256 48a535f26edda850…

MALICIOUS

PDF

70.5 KB Created: 2021-06-15 12:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: bf9ac78e1db6cd3036a054653ced1e90 SHA-1: b2ceb893601dbe35ae28d62227b2461369ef1c76 SHA-256: 48a535f26edda85016bb4993595e82806df6d8a3fe52e4a902f95d6bcf566e0e
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 0.6540

Heuristics 5

  • 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
  • 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://wastran.ru/uplcv?utm_term=brazil+song+la+la+la+la+original+mp3+download+mr+jatt PDF link annotation
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608d68e78eda9---bujedapuzorulofagofux.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/90579228804.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/649709e40cd5cba572b25556cfcc9ee4/xefojidodowasukipasoziz.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/l0mbibmj42sn82iuv57o7316pn/javibavodobobire.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/8e5bb3d0647bf4e5b1722c543a8340be/detagusar.pdfIn PDF document text
    • http://nktrading.qa/file/files/80131667667.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/tewinusaf.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af809e827c0---wujulutetetejisodufito.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/betodagikozika.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/11581946282.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/6c17baf97643175f7be3e5a9e2dfacfa/15030092540.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/1249f1f6c249bb22cba778ec6d40b691/bowebogufufujedibibumel.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832eab3339c---zifuwuf.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/251de4fdac96737979df03be62e88b1e/dipogimonazeweb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DB 5712 bytes
SHA-256: 0078408d67255ae870961b7c8c27dad324f412d9e11611298370365c4f3541f6
font_01_sfnt_off0000ea4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4A 2468 bytes
SHA-256: 06db5a57ea8788f969a2a90d7c2e37bb6758191cc37cb57cfce7f63857b235a7
font_02_sfnt_off0000f537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF537 11628 bytes
SHA-256: fc969d6839f6f7fe2e6367aaa706b98a2d6207978c3158979c768a8f1be88f51

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