Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fbb71faad1da949…

MALICIOUS

PDF

85.2 KB Created: 2021-09-09 04:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a9615f64fea624fbe2e9c5ae1d81cb1a SHA-1: 2d5939bbab435f807dbbcd32d4e0fc450540a35f SHA-256: 2fbb71faad1da949ecfc1c2a629a09b1bec28665e339afe75ca74fcedfed89b1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs and is flagged by ML classifiers as malicious. A critical heuristic indicates it lures the user into executing commands by instructing them to copy and paste content into a shell-like context. This strongly suggests the document is designed to facilitate the download and execution of a secondary payload, likely via JavaScript, to compromise the user's system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • 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=where+do+you+find+clipboard+on+your+phone PDF link annotation
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/17732876182.pdfIn PDF document text
    • http://tyextractor.com/d/files/zejidadotexawuvitivupidal.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/4175084168.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/zajedikisamemogufenimiw.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/rejuresapozetu.pdfIn PDF document text
    • http://standdominica.org/files/files/33261179488.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/gurimisavavinova.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/5ilbqbg65dal2i6j1fnnljisvc/wodazesemuzalufaxew.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8ae991f0265ce733cd46b97d5f2e755e/dibitarudizaximifufu.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/gitozogeze.pdfIn PDF document text
    • http://allier-genealogie.org/File:/fixapuruberufe.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/18105298958.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/keponenisolakiwiberuvumu.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/161338d4374d09---wuziluzuduwizodum.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/74753063637.pdfIn PDF document text
    • https://kristinanamaste.eu/files/gazejip.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/duzuvikabodajijonov.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/kedorisolegemofupodagoga.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/juvijalivemalafulumadem.pdfIn PDF document text
    • https://onlinendttraining.com/files/bekovoxadef.pdfIn PDF document text
    • http://briztravel.com/upload/files/65239280261.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/41108763712.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_off0000e815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE815 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10027 17932 bytes
SHA-256: 580fcacee3d089a5e4bf2301aeab49b28d9b2fafc0d82702b3f65a86a9189d88
font_02_sfnt_off00012e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7F 10800 bytes
SHA-256: 233660645468663b0ecc3702644598c5d4d694f8498e406c67d36815a79345dd

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