Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e8056379e7ec38…

MALICIOUS

PDF

72.0 KB Created: 2021-09-17 20:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: db3fab94f07438cf74ea6b3f45ecdf0f SHA-1: 5bf99c0786fe77889594d65b1484ed938324d0b9 SHA-256: c5e8056379e7ec38e7f6cb2c1772cd58d86c9a694ccb6a06c89a1fdef49f3634
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to lure users to potentially malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://workinhotel.com/upload/fckfile/vivebekofolakekuwijik.pdf In PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/80106497323.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/sonosimuvefegikafoxabije.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/0423f81c8e7e7b4efe2b4a2cf300d47e/todusiporavaselixax.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39290054194.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/152044eff16d782316ba7c91fa388079/91614142634.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/26135484479.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/mevif.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/xawizerafuk.pdfIn PDF document text
    • http://mqskin.com/luutru/files/bulifowot.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/rotapal.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/gapabofujifedo.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109070647246681.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/3838782100.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/patikozigiwabu.pdfIn PDF document text
    • https://clinicscrm.com/img/files/xukodesakorurimewuwi.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b113f23301---demutozeketapogiwulojadig.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/90427262532.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ibs328uu4ce3jt4jjngf6m7ukt/rafomezugusefusabur.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/70232889419.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sedobusese.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/fasomenotabotusemopa.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/mijodumusafowobusugaxu.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/tideseti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=pokemon+go+root+hackPDF 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_off0000b7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7CD 16496 bytes
SHA-256: 0a50a1cebf24908c09e79c74f6a63a82105bca5ed2d1066f2068b28a6cfe3950
font_01_sfnt_off0000e2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 10464 bytes
SHA-256: 96b54cf8ee2caaa3581493aa04fdadd32948b6a6bc2bbf2595d0d21a3eccef91

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