Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbec745b41721bc8…

MALICIOUS

PDF

80.9 KB Created: 2021-08-21 12:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c37d325bb01f9b5844be9f8c16c14f3c SHA-1: e7d6f5c28a6c017ef9579b7baabaeadb4b2d879b SHA-256: dbec745b41721bc896c9bf75406a763fd1daba7394557dd33fedb56c901d2d53
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document exhibits multiple indicators of malicious intent, including embedded JavaScript and a high ML classifier score. It employs social engineering tactics, specifically a 'Browser Install Lure' and 'Password Archive Lure', to trick users into downloading and executing further payloads. The numerous extracted URLs, many hosted on compromised CMS uploads, suggest a distribution network for malicious files, likely including the one referenced by the 'free robux' UTM term.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://catamma.ru/uplcv?utm_term=free+robux+copy+and+paste PDF link annotation
    • http://nagymester.com/userfiles/file/67544191107.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/01200655116.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/aee10c5626af7ee8423382ba9bf6bcd8/52539119279.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/36494468594.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b01a2b2290---4340987839.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/c66e4ea8015815a30af95a324da51268/43413663158.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/5459b40aa61b5ba08661ff18c3d95214/gidotijilisajade.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/s9f4th17p3jtt5crbv8ehgqhnj/42818233372.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/sazogadak.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/90309104797.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/a00f4e94511dab0057c71ba934b66eb1/janijikemuridagorurepi.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/23724348945.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd005678b4---49473847987.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/kamuluzususezuwusozisov.pdfIn PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/luzawe.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/d130065871f6b912b685cfde3f9167f5/67831077661.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f89d366ccd4---rexibuwimuporidoja.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f7ab8608d---sojapuxubaxeduzuw.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/rekunajodovoleten.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/dipisot.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/wejevorumo.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/wukanak.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/darewukopobuvoxeto.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/f77a0d191e4f68ad34021037d5f2fbc8/basetiguvawi.pdfIn PDF document text
    • http://www.fotoliaIn 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_off0000dae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE3 16012 bytes
SHA-256: 1c5d76381fe369dd0cea96381cdd6581c14ed38789f426cedd574bf29859a901
font_01_sfnt_off00010428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10428 10800 bytes
SHA-256: 999db1532783a5025de21d265d3b490864948afaf2b962c848a11619d3d7e348
font_02_sfnt_off00011d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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