Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dcd6edb19e11db5…

MALICIOUS

PDF

83.3 KB Created: 2021-09-09 07:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 33835a5c91b300aba6d9d0152af974c9 SHA-1: ddd264437a1950451b33a20ef17a4c0e59d58263 SHA-256: 6dcd6edb19e11db555611d11f26badbf39362b798e40060769d7f30ec984fd3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious link aggregation pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ibexquimica.com.br/ckfinder/userfiles/files/19309586654.pdf In PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/97549367843.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/59cf5010f6e473e603f0119be1e3e872/23014020284.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/66887608836.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/jozomimudefitojav.pdfIn PDF document text
    • http://onlinevay.com/upload/files/2036974169.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/gunejubomabudirup.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fixujibuxokifokivoxe.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16131a25468c7c---nirevurepepesesopigikul.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/34492628084.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/74246599764.pdfIn PDF document text
    • http://modero.vn/upload/files/zizuduji.pdfIn PDF document text
    • http://nova-auto.com/upload/36135298854.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/bosedijerumabozufupu.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/patuwulegozotododiji.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///81092204328.pdfIn PDF document text
    • https://ibericadearmerias.com/file/gojadeterarakubefil.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/73161400648.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/japaminawifiwokoliwidosud.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f547102f05---rufazefiwebovusivusofuge.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/3d94eda292c2e5cfc94c7d0980e5d098/zifabi.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/femipejovenananuju.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/15175299882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=falcon+and+the+winter+soldier+putlockerPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/pixavuto.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_off0000e0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 10864 bytes
SHA-256: 508d0c0136ed8e20873f509f163c4935ed7f7ebb2c4f5bc727d059163a4ea98d
font_01_sfnt_off0000f9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E9 17860 bytes
SHA-256: baef58e7f40069513294bd6bbc58826a64299fd6c510e58290d38a99c38c88a8
font_02_sfnt_off00012744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12744 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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