Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c24c7c4adff83b…

MALICIOUS

PDF

85.3 KB Created: 2021-07-14 03:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6d889798582779e375d0418397b0b913 SHA-1: d139ce6c9c80b684055f2fd57d1f95c0f5ea9c66 SHA-256: 71c24c7c4adff83bc85e0119ff72df4b159b18184a872a0dc233ee151002862f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. The heuristics indicate a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://laborke.ru/uplcv?utm_term=prostate+cancer+and+impotence PDF link annotation
    • http://absolutelyneon.com/userfiles/file/39014732814.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/82747536929.pdfIn PDF document text
    • http://firegallery.ru/img/upload/49763307463.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/85085821416.pdfIn PDF document text
    • https://landi-bg.com/images/file/saxaw.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/5d3454f7ebe5466375c7ea80e78d78e6/laginorenodod.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16075491b1b78d---72588522338.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/wovunevapan.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d8f1f6c7157c93dfe59444a059e857c5/vedobez.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/mobejokegelopabibinugemol.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/74628408074.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210625_80FB33DFADAFB06D.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/9246e723df473f0705aeba83add4c2d0/17490330177.pdfIn PDF document text
    • https://t2sc.me/userfiles/6957256792.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/v1hqklj1eikh7a738cr419nd31/13183431983.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f7b186fe7---xavunifugarotemefekisa.pdfIn PDF document text
    • http://france-ex.com/21072020789.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/pevorasemoxilodo.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/3959861046.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/4b104dc37d1f28eb6a45400537f2422d/47808174550.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/8ce1e837b384dad398c3c864ca84758e/riwoxinazevuzabopeb.pdfIn PDF document text
    • http://didopack.com/files/xavadesiterepowizuzirova.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d53361d91---bukixawukilus.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160756e146a6c7---61850976719.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/mexenigitus.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/5fvqgr28pi06uukke6g9e99cn5/44728009247.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6f40780c7---zemozewoxituna.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFB 10628 bytes
SHA-256: 3f3ddac171748d7da2f102fdcaca6d277c386a49c3193247e147dd3171636572
font_01_sfnt_off0001034c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5E 16964 bytes
SHA-256: 860d81b0e671154824c7ec15c93f2d23012e355519e7aee0fa4edcfc4c4dbd3d

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