Malicious PDF — malware analysis report

Static analysis result for SHA-256 740d03b0cf638605…

MALICIOUS

PDF

87.2 KB Created: 2021-08-21 17:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d294982afc2d723fc77294d7b6a3adf4 SHA-1: df7dc96cad712c4a1452033e35ec4de56010c565 SHA-256: 740d03b0cf638605405ee3d9cfdd512d672c0b1e97dcace3594e3ceee6fcd4d7
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://lejuriste.ru/files/file/90812264865.pdf In PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c5509404e44---75852555280.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/lukisafuke.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f148255827---61832591722.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160946b95e8220---80573161126.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/20824852699.pdfIn PDF document text
    • https://bursac.net/userfiles/file/16096911583.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/zufulogokubuvotaluzupere.pdfIn PDF document text
    • https://anjingliar.com/contents//files/dopujusujokas.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607787dfb87e1---73190319820.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/74508113099.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/wudusoxu.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ntuh1p5li445lmfkjk7jvbt3h3/64523978609.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/68973077039.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d8a428676---14568900206.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/3906743041.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/67800804412.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/1f3d65dfb0b15b2c3acb75064b20ad41/49051245425.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/78698894387.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160879fdfa9f64---mekukemowerufegupazosufix.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/1h7q5jkh02kupm41a51i1pvmmi/tazijikemekewevevajeriw.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1119c195e---36240743312.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/murigixulilurumez.pdfIn PDF document text
    • https://altbuket.ru/files/jujisinerezasegejolewula.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/mqs3qngit521stk1rk8rg4pshm/penexalawobedigobenunomug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=what+does+a+guinea+pig+sound+like+when+it+is+happyPDF 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_off0000ebd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 19652 bytes
SHA-256: 13835106e0218d452f906a775d36603bdbdda2991c3954defdbd719e0e009a0a
font_01_sfnt_off00011d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AF 10956 bytes
SHA-256: 40fc5f875109a272227f8052c673326c39fee509684b8e840ca63f5fa3019dca

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