Malicious PDF — malware analysis report

Static analysis result for SHA-256 69bdf25b41f5b422…

MALICIOUS

PDF

85.7 KB Created: 2021-09-06 22:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6b07db09a54342350dd5c7a0ebbf262f SHA-1: 3b925e92a07fafde4d3e52f31c9e230cf18a5141 SHA-256: 69bdf25b41f5b422efdb3c8a0a9f3b6973ebb477867c6d5801aa230e7ac89d22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://medvor.ru/uplcv?utm_term=bourdon+tube+pressure+gauge+pdf PDF link annotation
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/844cbc5298ac605e73681c0259b9319a/29102544988.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/rufirigejufibuveged.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/53d11448b41b519ef14d2f3fa79b5057/kegakar.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/tuzot.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/kevogasugigejuwivifowi.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/dglbl12flg73f1n91ee4bcfpr0/sufuj.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/rabovefelabavum.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/medakokusevamusal.pdfIn PDF document text
    • http://k1a.ru/images/files/file/60921675087.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/67758331941.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/60f3d6328da30070e534c69883c1bfe9/nazazot.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722af3672d0---23055785589.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160acd28ebff03---sexotivomiroxemotiruwar.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/xatizasumumezudepab.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ebbf77e0e7336d06fbe5b634eea5436/86512859059.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/9228ec7d9d3bcbf7febc62f8fe9d8ecc/sulejijatufimumamiw.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/54353541368.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/13452064630.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a781ae111---gubesadivonobu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aaaa8c0b879---23846969688.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/55518399914.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/80986111024.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/22939182548.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_off0000e9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DE 18064 bytes
SHA-256: b759569922142637f2404d586ab5b4148430d0bf1a7c19bad20111f6ed588801
font_01_sfnt_off0001186d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186D 10828 bytes
SHA-256: fadba0776d3f38880fadd9515163e0dd950dbb41dcee40686c5733c55412c223
font_02_sfnt_off00013124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13124 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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