Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ea3f69e18c8d6f…

MALICIOUS

PDF

60.3 KB Created: 2021-09-18 04:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6ce0cf031aff2e7da99376a7b3c03030 SHA-1: 680aac63d4da314bfda156c9094a4ab91248f794 SHA-256: 44ea3f69e18c8d6f04ac98d63051a3edde35825e966c2492093d14787243fc6f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other potentially untrusted domains. The primary purpose appears to be directing users to external resources, likely for phishing or malware distribution, rather than delivering a direct payload within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8393

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://krisoc.ru/uplcv?utm_term=sas+planet+android PDF link annotation
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf9ae2bc4a---mabavejorudinalufugajoti.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210901_B2FB0984FD99FB63.pdfIn PDF document text
    • http://ymmicro.com/files/files/sixovodofu.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16134adc98ab69---bujipinatapepedigovovo.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/82281869693.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/sutelezisarerevum.pdfIn PDF document text
    • http://liily.jp/upload/file/20210906161122.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/ninezasizusewukovari.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/dcf2ab5b9d779ae877393997f08d6d59/76073728810.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136894eade57---rukazotijugosakasesaf.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/lotumililumekije.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/39835880332.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/71702118351.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/wiwureluzojatok.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/6296880666.pdfIn PDF document text
    • http://ilkemymm.com/image/files/35301205396.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613527f267567---mewekozudivuluzol.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/pisinix.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7d0ddfe024736b2b0a975e75015599bf/3143131121.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/91787697657.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/24780573468.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/nenuseparozuvivadukiwa.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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