Malicious PDF — malware analysis report

Static analysis result for SHA-256 669e3b4f42bc64f9…

MALICIOUS

PDF

90.9 KB Created: 2021-09-05 13:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2e9efe6cc647e2da96cee60aeeb30c9e SHA-1: 108358c3f60f0cd9fe4ad3e4582db514d173c92c SHA-256: 669e3b4f42bc64f9013eb31b269c06de86c7277b08c65828e497de241b80aa4d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated high maliciousness. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The presence of a link farm pointing to multiple distinct hosts, some of which appear to be compromised CMS uploads, further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/2905536190.pdf In PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b667be11f0---65049572560.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/lovimaxedase.pdfIn PDF document text
    • http://krupongs.com//images/file/64080397321.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210608014422667663bj8lg.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a9b59f45a---63074349366.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/cb729fdc01ab80eaa7298f994b16fbdb/bakalufakododi.pdfIn PDF document text
    • http://statenbracy.com/clients/d/d3/d362857cea7b6c304c7898dd6c6993b3/File/19292530469.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081c459de1e6---42922199918.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/37f2176abc6694a05c2cd7e7cc04d0be/vugebodunemevu.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160afae8496501---92719395731.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/dh7tv2h8352a9d84u06okskcco/gulagid.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/84837877591.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/65449245577.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bb7852002e---19670835747.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/824100d01b58794c40b19f687f1587a5/41448897236.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/7760358240.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/zibenibetosasefuni.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/83665607092.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/senufapinajababazodowizit.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/7781ec92904030fec5b0b7ff685846bb/dojatinigekomuw.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/pinim.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/varoxelimibelovuwabafap.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/gijogap.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/30033116668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=honeywell+th6110d1005+focuspro+programmable+thermostat+manualPDF 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_off0000f8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BE 11884 bytes
SHA-256: 1dde8e197aaac0692a5bfd77af8a45348142ee944f1b2b1a5bca49c73999b6c1
font_01_sfnt_off000114c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C6 19272 bytes
SHA-256: 7c56b7dbfb87730432f9e3d97c31b672901db5f2cfb96b7c3703c5edee5e2d6f
font_02_sfnt_off00014540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14540 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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