Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52ad0d0e1211d11…

MALICIOUS

PDF

56.8 KB Created: 2021-10-03 12:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 04d367bb37352863c8fa1d48b981746d SHA-1: 415fa641e294ae29fa3e20b9789cfbf919e8c7e2 SHA-256: c52ad0d0e1211d11a7ce11be3b3a6f6f1adb1d3d0c9f89d7d3d311d208685418
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, indicating a phishing or malicious redirection attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of external URIs and link farms suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7865

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://coretry.ru/uplcv?utm_term=bmt+for+sickle+cell PDF link annotation
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/edd35240c676b112411b1ab28b0b19fb/55128165001.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/diganedabobiv.pdfIn PDF document text
    • http://partnercable.com/files/60655170252.pdfIn PDF document text
    • http://full814.com/upload/files/37279994902.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/dagikisej.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/47386040400.pdfIn PDF document text
    • http://sbcnepal.com/images/file/447572401.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16141f1659cdf7---gomegugulujugokatepekaxu.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/ramivukulegu.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130816398897---45704272740.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/57849200303.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/tawud.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/59530128723.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/sukujumixifomodo.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/96293047502.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158c1c97d683---35869181694.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/33732114417.pdfIn PDF document text
    • http://esejsc.com/upload/files/voxiwagexonopetofa.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1614764c397c5d---15619977330.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/32931858560.pdfIn PDF document text
    • https://defi128.com/userfiles/files/31787430842.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_off0000b156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB156 10376 bytes
SHA-256: bbd9c638ace95b1c2f8619135f9144a1a383b5786a4f5fa40a65ceb32f0b6dd6
font_01_sfnt_off0000c8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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