Malicious PDF — malware analysis report

Static analysis result for SHA-256 24db9f1355de2d46…

MALICIOUS

PDF

81.6 KB Created: 2021-07-31 21:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c3ece2b3b3451e0089ee048a3939a5ab SHA-1: d7b2264f1419f16a87a83356affa43b0d4e7dec8 SHA-256: 24db9f1355de2d46c9e3bf62105c146b56996037713a6adbb0b01d01e2436b5f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://irlanc.ru/uplcv?utm_term=fichas+de+silabas+trabadas+pdf PDF link annotation
    • http://vitaminyplus.eu/files/file/savasubulowupipuwus.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/ec7250bc8b6d66f7774b36e680f6e100/sovagelajawitebate.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/157071056.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/95325721856.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/zofaxewanarafosobikobomu.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/111f0168e3c9d6390c82abe27a209985/49562684447.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f66348663---xobebewumimemub.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/41518221660.pdfIn PDF document text
    • http://vtaky.sk/media/file/jejaxepom.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/2n11n96q23fvvovc8soj9qkvn6/lipasojubedetuzejejakit.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4a51417f3---90806373139.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859eec8fd00---20968942370.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/27252890088.pdfIn PDF document text
    • http://temple.mo/userfiles/file/61243417457.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/rarulanebiduneroxanaduba.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d94db53045---kazufililiguzagul.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/subojawetanugemuru.pdfIn PDF document text
    • http://specimport.by/files/files/biliraxo.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/kiziroweb.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ca6981625---8838241113.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/78304016901.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebd75cb3f5---tetedukiwigetijawen.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/39952410806.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/natalipazikukatijuguf.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/306d83f6b0df077dc8b54a45c4d02fae/zufekedosijaw.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD743 10612 bytes
SHA-256: beafdc78ded040cfb028583e430fa2cbe35ae40e5cc0981a244f4f76ab75029c
font_01_sfnt_off0000ef5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 18340 bytes
SHA-256: 7431d2a9e73c9d1b6a6a82ed88d8b1f0d49c22a913d4676f17a9ea74f2dc6efb
font_02_sfnt_off00011dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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