Malicious PDF — malware analysis report

Static analysis result for SHA-256 e216c57c499d4a34…

MALICIOUS

PDF

79.7 KB Created: 2021-09-21 02:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fdf10e10f2a757693805237e9eeb1176 SHA-1: 21222f52743d4573d20930c39b7ba34064a059e9 SHA-256: e216c57c499d4a34ab4dfb1485fa3944fd60e118f81011223688d15bd300b68f
204 Risk Score

Malware Insights

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

This PDF document exhibits multiple indicators of malicious intent, including a high ML classifier score and ClamAV detection as a phishing trojan. It employs social engineering tactics by presenting a fake download button and a lure for a browser update, aiming to trick users into downloading further malicious content. The document also contains numerous embedded URLs, many hosted on compromised WordPress sites, which likely serve as distribution points for malware or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=how+to+view+bluetooth+sent+files PDF link annotation
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/06afcaeac29eaf1859553c1cdf6b66ca/tubajevimavajovopomiguju.pdfIn PDF document text
    • https://uangraja.com/contents/files/zuluber.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/54985579851.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/fenidosisifexaxo.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/20103491032.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/65346894427.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/viguzirepuwupapadu.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/22955900352.pdfIn PDF document text
    • http://52963566.com/upload/file/202109182043532519.pdfIn PDF document text
    • http://adriennemason.com/assets/files/13808585917.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f92676c2c---9932378862.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/uhe96ev2gelvprdv37dnamsine/79315262242.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/terol.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/papuxibo.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/lizojo.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/leximabugenewoz.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/dokuwuxuwoludi.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/vonoxijowupevo.pdfIn PDF document text
    • http://spbi.cz/res/file/vejepusulivoginut.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/c1p4q0jf0meljdpd5sjdlogo91/11007077561.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/28158615036.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/tosazetujewewezanu.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_off0000d185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE997 18552 bytes
SHA-256: 20a96ff7b156f297e4726babb6c9f43dfcb703ed1578a19e67cb47012cae136f
font_02_sfnt_off0001198d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198D 10432 bytes
SHA-256: eb86fb6a26141cfd2d9431d74b91013d637c387baf89637c060a8fdb1b2cec31

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