Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc9417421deba2f…

MALICIOUS

PDF

79.3 KB Created: 2021-08-09 19:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5daf2b49cc5d5ddaf616d50a5c8e5ee9 SHA-1: c2fef9aa47f52434b9b35c2c4674ac247a1889d4 SHA-256: 7fc9417421deba2f32bbbdcf4a4d135556357a3c5e3eb5854f541ec2bf516433
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7bcae368a---liderutupexopozilovuj.pdf In PDF document text
    • http://tfforming.ru/d/files/36816363274.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84fef84bcc---21932236539.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/8c6df77a289b29142d19ae154f25000d/16376451426.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/p2ujrr6qb9ui2q6tgargb6r37g/laridudozujikiwosifa.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/wepafok.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/2969a062462d810f5fc97e77e1bd451d/11458700778.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/01bbff59e3437ab07b57dee2ef61b442/zijenitaf.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/58922938462.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781f1ab13f1---bilopexivewawumiwumefef.pdfIn PDF document text
    • http://kechengchem.com/upload/files/91419269756.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/xejipupiw.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/417f8e43b60192504e6cd1b2f28945cf/kowamidenen.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608321744addc---wugelebovefiduzeli.pdfIn PDF document text
    • http://manajrgvaaradhi.com/cms-uploads/files/3107984057.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/35938223571.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e1705d5c0---xirasujepuwonoroliduzew.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/iltshb2kn971e7icvknouuuqk7/selibofola.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/8475321716.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/52d4e2d34b5bcef6c83dc204e55bf4a7/vikeresuvumolivawum.pdfIn PDF document text
    • http://mahlkoenig.nl/app/webroot/files/userfiles/files/digubozapiset.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ngs358ti71v9gmfscqsf31fudh/puxavajurinozuseliwa.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/9c01b5fcb3564c1c1c5e54b681048824/70791318019.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/d00a5d8f52c8461de19e2b12b4a25026/82764404505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+long+to+whiten+with+opalescencePDF 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_off0000d1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F7 16740 bytes
SHA-256: c9b990958229b9905d0249aa834eee8067899a6c36ae3edf0bf9b11e0d698bca
font_02_sfnt_off00011571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11571 10632 bytes
SHA-256: 4b8cb2d68ab5b90196167c4f647120b05245dbb027498667bd43411aace2be0f

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