Malicious PDF — malware analysis report

Static analysis result for SHA-256 20fb4f34b388dab9…

MALICIOUS

PDF

86.1 KB Created: 2021-09-03 11:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 41daadc99f73eb28158e3dbe80ed0812 SHA-1: da371dbfe42a387f2bb7ddcf846f0ee102fcb145 SHA-256: 20fb4f34b388dab903ee6554d165e478c5908853f44cf19705e1112d6d7a8ea6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm for phishing or SEO manipulation. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://shukokai-voves.fr/userfiles/file/57406881490.pdf In PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add7305e1f0---30123171101.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/voxoku.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/48954899572.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160774de33f06c---begoteg.pdfIn PDF document text
    • https://geniodelweb.com/file/rijure.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/58462035819.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/83036594010.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/76600217092.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160729fffeeb38---43071981784.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/gomibelogogerezitigulesa.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/bonimisijotofarepupuke.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/53209111090.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/8obr49ov13bhmcvvffp295kd4t/96293606605.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c68b1ece0---58907039452.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/felujokofipesazodi.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/gurewufelojom.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/xedunobinogilawidopevunon.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16076d2abb4369---69667722691.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/11719739662.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/0513305124.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/94490518203.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/bf104c35c56d96a6aa471c79d7b12c0d/49613336052.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f86f24a998---6725104399.pdfIn PDF document text
    • http://consade.com/userfiles/file/67570581645.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=predictive+modeling+definition+pdfPDF 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_off0000e8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B5 18768 bytes
SHA-256: c29f719bc9bb9b8bb4abf17030b8bc4ea0742185ff3fc1da21d811e5d656cf61
font_01_sfnt_off000119e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E7 10700 bytes
SHA-256: 3e073dc92284a4e6125c8efad9fe5508626672e52c182025f2b71dd31853566a
font_02_sfnt_off00013230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13230 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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