Malicious PDF — malware analysis report

Static analysis result for SHA-256 b425d006a0fbc57f…

MALICIOUS

PDF

86.7 KB Created: 2021-09-12 11:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0f65c0e45d71c6678d5ba4702d165d6f SHA-1: 57807a1c26053e67beb3c436bcffdaed1f09c665 SHA-256: b425d006a0fbc57f825d3538f83467da7f0166687a838d10e7591fb3434ce070
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The primary attack pattern involves using the PDF as a lure to click on external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://floridagreatescape.com/media/file/25796471786.pdf In PDF document text
    • http://geyikkimya.com/userfiles/upload/file/riparirazonukifurenize.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/xegasuwabugewibevaferuxu.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/lopizunaruzesedizuz.pdfIn PDF document text
    • http://ozcetinler.com/userfiles/file/62590781223.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136b6e072eab---soxanigumovi.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/lebosepifisanupug.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/xepogemot.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfbff9c10b---pawumigaroditawus.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/84570511555.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/39044586703.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/11314568686.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d846094c0a---80588150221.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/temafesaf.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/25050745165.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/kebabibugugefutidujubegun.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/06ef625b9c4db17bcb81c6d44f02d5f0/bipevedanuzadanode.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///3543569580.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/vstdtdk7kbotfmfvrsmrr3788p/rovakevuburugil.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/kamalaveka.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/q3hu6qiks8clllvf0qf4igftj5/giwiw.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/kasurevexuzipifineves.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/97773447797.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/divavevamigajiparobajoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pinterest+android+sdkPDF 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_off0000ed5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5C 10288 bytes
SHA-256: b5ff34824168d58ec46792e27f645fe6588cd0b2d01d693121d9cb5c14fbf06e
font_01_sfnt_off000104aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AA 18352 bytes
SHA-256: f288a0657db51a802441f99b9c2371736bcbe01a359c0be5b53a2bba2071dd5f
font_02_sfnt_off00013518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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