Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0de2ca51df47ee…

MALICIOUS

PDF

94.3 KB Created: 2021-07-08 06:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1aaa22a58817dc88cac01c7cb6b9ce13 SHA-1: fb5db529e82e522b00cd06686cf713d7414f5a19 SHA-256: 4d0de2ca51df47ee8f039202e689215543b1ed73c5a96aa4f7f1975890c4c4fd
176 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. The document exhibits characteristics of a callback phishing scam, prompting users to call a number for support or to resolve a billing issue. While no scripts were explicitly extracted, the presence of numerous links to compromised CMS upload storage and disposable hosting suggests the document may serve as a lure or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cb18c702f---21861232726.pdf In PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/mkoe4pjjlpbsl7k8i6hjl0ucu5/birisarajaba.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/72891945011.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/11299826915.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/4a7184056ea07ba4eab6f50f009e6ab5/waxofidojenumodesiruzebu.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/53345adfe455ab5645ff8ffc37cac8fd/zujugodemefovozerak.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/3747655318.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/99851990804.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb7897fafd---noloduzulakegigiseko.pdfIn PDF document text
    • https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/17453f84c2c82d770a7141eda9195a2c/14115185868.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/1t8gb5pi47ak4mdjra5le3b106/fikafa.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/34825926967.pdfIn PDF document text
    • https://fallsplat.se/file/lirodobonenukelip.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/27b9f2c0b75036405c0a502312899100/rinipezetoladedejotikil.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/222962e51a0eda877e862e9a57fe6a5f/manatinik.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bafc8402b23---75427498779.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/9f20fdea0a5976bf17ffb54625efae37/pegelarotumuleti.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/pixugefed.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/638d2bd0f575921f4cf144d56acc2569/51708140439.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e45deadcbf41fbe4f6d6fd6840254741/70589081199.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e9a5734eb---81798044998.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/71917978760.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084d43860260---felarolidekuradiwofukuw.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/modawebe.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/limiwibezoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=final+2+march+madness+2021PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12501 17624 bytes
SHA-256: cb56775ec79501864461dc2fadd4d1687cae1fa330468b5f5184f85962adb54f
font_02_sfnt_off00015363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15363 10688 bytes
SHA-256: 0b28bfb7e3a04d7f74db912bfb531ea6bac365a6b1aca68b788e99ff7954b360

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