Malicious PDF — malware analysis report

Static analysis result for SHA-256 b17df5b56cd34dab…

MALICIOUS

PDF

81.0 KB Created: 2021-08-23 09:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 39929f40ba5bbb51e97818b60bb9fe5f SHA-1: 2613ffd97e84ed80c93f0bf9f1909229da48fa44 SHA-256: b17df5b56cd34dab534494bca2a18b6ce4c68e703b703461ac1933a1874fc565
244 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and multiple external URIs, indicating it is designed to lead the user to malicious content. The heuristics strongly suggest a social engineering attack, specifically a ClickFix lure, which instructs the user to execute commands directly. The ClamAV detection further confirms its malicious nature as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • 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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://oniceh.ru/uplcv?utm_term=exe+file+opener+for+android+free+download PDF link annotation
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608530ea05256---84229022360.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/17a8cab29980e9a410d99566528eb0d3/44388912353.pdfIn PDF document text
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/70311072951.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210627_ED029547DB32AB7E.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/mubofafujupubunu.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d43c09481---fediwadowex.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1cd2f1a904---kajamejisubiwexe.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/77981854347.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7deab3ce8---58529346029.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/golasazilux.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d02997d465d---turareguzo.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/puwibedofijubewoturom.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02f531cfa0---52951383002.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/85309633962.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/gomibatojojujotadul.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/sowebufigixozukojegamajef.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/sagugelodilik.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/wozenoguvimugodevirum.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71e8b2d4cc---zumibewirati.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/wejobomogezo.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/pivododasunodakunovevoxa.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/83646025460.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/40365340855.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_off0000d80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80F 17256 bytes
SHA-256: 2ec41fa1f849e4c8d4b6b8086feb47d9f0cded4bce1a4079f81c1452d1a39460
font_01_sfnt_off00010597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10597 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAE 10396 bytes
SHA-256: 1a4fd1971748f34a86a050ed774a4ff648c7a12a2d7978c0e515b537fa229492

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