Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe1e5c29c930712…

MALICIOUS

PDF

86.1 KB Created: 2021-09-07 12:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 34bd32de1c279cebd3d4f92baba4ffdd SHA-1: 950e42e070d0df5a65d769aacb6f5f1024850341 SHA-256: bfe1e5c29c9307120929f1f42fac9f18b28b24319c56da464f36bcdc9cbf2545
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF document contains numerous links to potentially compromised websites, suggesting a link farm designed to host malicious content. Heuristics indicate it lures users into installing browser extensions or plugins, and also prompts them to copy/paste content into command-line interfaces, likely to execute further malicious code. ClamAV detection confirms its malicious nature as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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
  • 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.
  • 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://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077f63910a7b---31553332903.pdf In PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/nipozejaj.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/41457175066.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/sinas.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/bqmrvtsuol5vicdudqdfd5k7n2/viwesariwigokinipumaloxuk.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ba0ce01b1---kuwigawezomibelod.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/vazirufodafewejelogu.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/24065531f86cf9819c7d7110280b7fd5/93546437842.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/besugojorowewevi.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/82661420528.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/retufizujuz.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/kovigivatak.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fadcf61b26---21510420059.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/rasaxojekelivukij.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/63862571752.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/87352524026.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b46a64b439---bujip.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/sipubovupekujot.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/6bdffbf972f8bc77c68405ff3e73baf0/juwakafurabelefixogonibex.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/miwimil.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797bae4107d---85720772112.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7d25cb40067603777f2fdb7ba4a64b91/muzavifuwu.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1534fd1cf4---botebiwifowowebat.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b962360a994---6050892722.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/pepotarorufatorot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=participles+used+as+adjectives+pdfPDF 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_off0000ee76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE76 16936 bytes
SHA-256: f6e30e1602e452e11656dac34141d432c39397a00d6ba3128e5cdb96767dc529
font_01_sfnt_off00011a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6B 10684 bytes
SHA-256: 1ab96c1487cdfabef803b4c410c07d343416b30fc180f04a016750526415ac11
font_02_sfnt_off0001330b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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