Malicious PDF — malware analysis report

Static analysis result for SHA-256 4111c01a1a278000…

MALICIOUS

PDF

75.8 KB Created: 2021-09-02 16:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ded0aa49070dec48e30d9e32d40310d6 SHA-1: d0fba1bca456c2472d32203f27dfcb02181be81d SHA-256: 4111c01a1a2780001789a5004c99755c3b46a071d8a41771e5bc2d54c7a88e77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious or phishing content, aligning with T1566.001 (Spearphishing Attachment) as a likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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
  • 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://penzionradvanice.cz/res/file/75356117490.pdf In PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16113798e49bf3---87426500326.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1739d957c---48419170575.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/zefajidugadusiru.pdfIn PDF document text
    • http://htygroup.com/upload/files/jawirelufururugapebowos.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pofowuvino.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/28628250763.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/11679100413.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/rekijarifexorevo.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///fuxemumefigedupere.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/vunepi.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/dibaxus.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/76799228485.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c962c8f343---59485148799.pdfIn PDF document text
    • https://ienter.bg/files/50361826673.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/0522a13d5be4247b632dbc7e58ff9403/32638216913.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/5ec7f0cbb44e20d6beefd8c4dcd38a62/1840360684.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/52651988890.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/54364142455.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/7f8c46d96d9928a99f9de0edb76e6721/wobitonesuwanubefap.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16101354f9fa00---xizonaraxudot.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc26c28d8e2---34835491840.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/3344143406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=errors+in+measurement+class+11+pdfPDF 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_off0000c3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DB 10916 bytes
SHA-256: 9e9c100742c36e174218a6f1b8d1bef9a9c4080a1f1ddfb64110a4f48d10a6bd
font_01_sfnt_off0000dd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD23 17336 bytes
SHA-256: 8031862f4d35ecfc5d1fe407eaac7614bd9cef05f64aa219d708fef0befe0492
font_02_sfnt_off00010978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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