Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9aa50e278e7acec…

MALICIOUS

PDF

91.4 KB Created: 2021-06-26 06:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7b4806ec328135eaf83e263df40ee643 SHA-1: be8003b1372adfeebfc9ab3c0363323dd27bb898 SHA-256: c9aa50e278e7aceca0e4c6a45bfa27187392eac28fe563dd3db9a353df611dbc
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious. The critical heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document likely instructs the user to copy and paste content into a command-line interface, such as PowerShell or cmd.exe, to execute a payload. Numerous URLs pointing to compromised WordPress sites and other disposable hosting were extracted, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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
  • 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://laborke.ru/uplcv?utm_term=chromebook+boot+linux PDF link annotation
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098267c92b99---namogofulegukew.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/bujivopisu.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/8e4d8f8d7ae86a98f4e5e8aac9444fbf/22757354544.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160882ca717b8c---kazitoroxalamawusekuwat.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/lipuje.pdfIn PDF document text
    • https://mytopics.it/uploads/file/rikalobifakimot.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/gopovi.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/8822d9dac9eaff893d313623310c5099/poduravulovalumanegob.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cf20a64b9---sibuvulivanaluwibit.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/af7050d3d79f4ad56e0c3bb6bef2a8e1/telumig.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/66982366512.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/66258195362.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/5kf9ruptmn0e3f9bb0tqfor0f4/64640712995.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c9134741e---lofokowidir.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d97933ff3a---dugapoxokujodedupadovo.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/69355376308.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/2879dbdcfc8477cdba91db8f87b7726b/wepogomemidavazigof.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/600ea0a0d27d4f503bc2f5599317cbf4/61501398373.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/lrc9cmh3rspbqj5dg9tp6b2ff6/bamudigubapiwe.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb729dc8699---tikalomududurir.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/284921516e15138633782dd15c7a2078/turifexewogititapasuw.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/1278618511.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/2ph0b4d7mp2nc76sqc2fg4fj1g/gimet.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/bakejojikarabitokirijomez.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/lekizumuwolap.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_off000101f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A07 10508 bytes
SHA-256: 704a3c5e51843e30f39465eef3b19e393fdb2e9db659fd25bb315efd3202d350
font_02_sfnt_off000131ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BA 18220 bytes
SHA-256: 823457b8ecad8dfcb53c6b50b3202f54b162313b4d8e53622d790edcee551912

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