Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3fd27d3d3662179…

MALICIOUS

PDF

79.8 KB Created: 2021-09-04 08:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 319c814efb63be192eb85fea14119904 SHA-1: 66034f753487c6383ab72c8d55cf80598d170869 SHA-256: c3fd27d3d3662179a010d3aa09328d32cc3485c0c42c4ad542e495e1e143e164
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=english+olympiad+sample+papers+for+class+3+pdf PDF link annotation
    • http://melly-incendie.fr/img_db/tabumubuginekebaju.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/52134925299.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/39226379784.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/gojizasiteja.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c0at054qp3tb0o1flda06krps7/ranal.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/nexonasila.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc0de4c06ed---panenuvevoluzo.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/06/27/beravof.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/nuzeruriziwenulitosit.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/49192272415.pdfIn PDF document text
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/1470345781.pdfIn PDF document text
    • https://componentcnc.hu/uploads/ckfinder/userfiles/files/mawipodor.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/afeb22ba8a307c4c2600d4a4211bf655/2262432339.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/bdf57fe1b9845fef495df13bebbf4fa3/punamogifipuvatinig.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/kapazixiloloz.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16092f2e6dbbd6---21384223237.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609f516723e9d---kujuji.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/90055993858.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/purasisutijijanenapus.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/zafisosuxutum.pdfIn PDF document text
    • http://udemadriatic.com/userfiles/files/94947059667.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/55675892650.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/33374817401.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/23722836483.pdfIn PDF document text
    • 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_off0000d26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26D 11240 bytes
SHA-256: f2942c7bfaa28739ad6357c88531dcdb4f26fcb3eab73db9a5404e4020060e34
font_01_sfnt_off0000ec58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC58 17144 bytes
SHA-256: 1b2f2942f40467f41f1cec444d06b883976c06e8908b789e4ebfc13dfbd6a1c8
font_02_sfnt_off000118a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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