Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3704136fcdac28a…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 04:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 502504d3947f5a053508259ba40c4d2e SHA-1: b03254eb9371fb5708cef0d319db84b12b9e1fb7 SHA-256: c3704136fcdac28aa13c02556c71077371a0428b333254df3a660ae0bf826b94
244 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and a link farm pointing to various PDF files hosted on potentially compromised or disposable domains. The heuristics indicate a lure for payment redirection or browser extension installation, suggesting a phishing or credential theft attempt. The embedded JavaScript likely facilitates the execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://kotolantopeni.cz/file/nirumatolimowadelapulu.pdf In PDF document text
    • http://chromavials.com/d/files/woxalamufofap.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/wutewilarebitada.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161319a6962c52---76829750989.pdfIn PDF document text
    • https://aneri12.cz/res/file/47911805352.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/ponukirojimad.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/darexovubujufumu.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/budepelirisizoxujeparoxi.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7fb10f49d---tojiwimewelig.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/zeleromaloxugalimunofozu.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/72380949481.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613407353d3ef---18524848759.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/jasefelagujukujawa.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/wuxasezirifulimaxe.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/90947398176.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/25458814817.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/vawajisovokigud.pdfIn PDF document text
    • http://panova-art.com/files/file/4627657901.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130377c0f0b9---poxasosum.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/2427895102.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a09e24e07---75744036792.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/fa748d82a7f0927a9e703b49aa96ae81/6550764361.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/12726096451.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/26648837748.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/favitewaset.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/tovomemexatedanonefitakal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=transfer+messages+and+contacts+from+android+to+iphonePDF 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_off0000dc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8B 18848 bytes
SHA-256: 040ddb330ce8512d04dd95e819555e2965276c9eb5ef1ae3db79cbe43a9a3f69
font_01_sfnt_off00010db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CB 10984 bytes
SHA-256: a4e2fd71ca1e879ed2aa4e926df3f7535cdf890041906516624c2f6971765f49