Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3e70caa3017542…

MALICIOUS

PDF

87.6 KB Created: 2021-09-12 23:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 866e2dc6963609f1c140ed499cff5be0 SHA-1: 2d550f7ec1716f68aa1a235106bf1fe13121a494 SHA-256: da3e70caa30175428a0d3b8ddf1041a221de4fd0f3d3f72dcf4741bfb52fc179
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is part of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://protradingindia.net/userfiles/file/75828295426.pdf In PDF document text
    • https://koratspring.com/upload/file/rizofokosupa.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/bezevavifuxanesote.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/55066241751.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/bakofapasibowofup.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377e20294c8---41467863683.pdfIn PDF document text
    • https://novitas.ro/files/biwuvagubevimivuvatebaz.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/9091804976.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/wewozimituxikomo.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/peder.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/xefenilevol.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/24239633078.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/mawona.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/e6f7e28d09c55f4951b42aa8f1c6b66d/91467898649.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/q8o6jujmd4rtg9tb6odaqgdkuk/55380397695.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/80562806204.pdfIn PDF document text
    • http://naviway.su/upload/files/47947348650.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/53402475875.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/dakugirewenag.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/031bf38c32425f962138a9759f34edc3/fajadugi.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/68882500094.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/etoioaedb107v5ccd6185219h0/85389878036.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613dde9b21640---47269135775.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d63d10de2c---1097425701.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/burubonotinodimuziwipurej.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/maxipekutedar.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/st54c5g1khcpf0u8qbrujoofhd/labokabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=close+app+timer+androidPDF 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_off0000f386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF386 17180 bytes
SHA-256: 7bbc6aae2402203a3737275e430706a759c0110aa08ca4575790c72790b284c7
font_01_sfnt_off00011fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD9 10584 bytes
SHA-256: a05e5c1c4d90d09b95fddba87ad9247149f0f1893d0c6225f39f9008ac60a33f
font_02_sfnt_off000137ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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