Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f8554481c64d63…

MALICIOUS

PDF

93.4 KB Created: 2021-07-04 15:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b7be0b4e9442271ad6a09197a4a09318 SHA-1: cdb6d643751bf3aefc213786d8270b9b13a7de24 SHA-256: 18f8554481c64d6360a61d76b0ba439f50ce3e37762f9236b5dfa9db5b55e71d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or malware distribution intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://anandtouristcorporation.com/uploads/babupaxetadasos.pdf In PDF document text
    • https://twr1115.net/files/fckeditor/file/24393564163.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/jaguzalu.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160ad94c770094---1395965025.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e32a76fc---bitaxe.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/kuguxusogukunawomed.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/12283902309.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32aaf3bc58---sapiniteduve.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/99014020170.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/tipexe.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/28402249921.pdfIn PDF document text
    • http://toonesk.com/upload/lugotefoxux.pdfIn PDF document text
    • http://fitviewer.biz/files/file/zaloxim.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/nepedinuzajuge.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608293da1576e---nadufupewulorenof.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b0d1e6026---68542437734.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/5mm9q0frr94ge0n6i464clpeo0/36324617746.pdfIn PDF document text
    • http://firegallery.ru/img/upload/48494539375.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607683c91d100---5347653745.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/89724647445.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/4jcghuun8m5cfc2i0punv9mep6/voxigenene.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759f93dd8fb---gatagutixesobulab.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/58ffd54257383387575466c105c0bb2b/kugakuledilolizutixe.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/75297016599.pdfIn PDF document text
    • http://giaoducvietnamtv.com/images/ckeditor/files/vobuzinub.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/litejiwipexozer.pdfIn PDF document text
    • http://wenxuezj.com/images/File/mimugejales.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a352ebfbbc---disogidanaxojon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=breakdown+of+carbohydrates+in+the+bodyPDF 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_off0001098c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098C 11012 bytes
SHA-256: 4c984e1a0f92cf48c926f2d0d933fc1a6d774bdfbfa49c66c48c099787a41f59
font_01_sfnt_off00012331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12331 16984 bytes
SHA-256: 5dfd6481450a06d85f18cee73edb9cc32a5b3a98a66e48d3271f8a781025365f
font_02_sfnt_off00014fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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