Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea7f390972d0c70c…

MALICIOUS

PDF

90.4 KB Created: 2021-06-26 21:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 21eb68e350788e11a52b08f2f7885e13 SHA-1: 75cb67fd706fa5986a7ecaf57ea0328e195811fe SHA-256: ea7f390972d0c70c85a04c4fc7112aeb63e0b830d42fc7be62060a632ce927a2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised websites, indicating a link farm or phishing lure. A critical heuristic identified a 'Clipboard command execution lure', suggesting the document instructs users to copy and paste commands into a shell, a common technique for executing malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://sumtinathholidays.com/admin/uploadfiles/file/26969360428.pdf In PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/da82020397ba5e5ed750e398b953d6d0/parunixumaxewesevopopi.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9557a7977---20664066035.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/8e6c6c0d4c341c44c62a1fd11a2dbd99/satipupevubel.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/bimobuxodewilazakoxuvuf.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d44c85ce9f2---44981202107.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1891a9e09e---50861939296.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/xanoxowitaginamerib.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608630420d813---70391342049.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086d2943f271---vavemopuxubidon.pdfIn PDF document text
    • https://loctra.net/userfiles/file/64393827759.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/72175814412.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/8iionmfeie85esou4vpcv149d1/roravazexora.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/4fc22ea458261b4d6bcdbb028a4d8877/79405370133.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e454769521---kavafupabuvezekefap.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080c3492499d---56400182965.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc47d0b09dc---jokebenajomemakojolibujan.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160800850d2d24---wujirojadawejewiva.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/74730206144.pdfIn PDF document text
    • https://unosms.us/userfiles/file/logowabuzij.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079e59119187---bavoxatititogopuvunejad.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/o1vmsb71naln3brm2h9v1r0777/rawefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=network+troubleshooting+tutorial+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_off0000fe75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE75 11172 bytes
SHA-256: 80150f6b23210ff7e8a533893941461c752723daf008f640407b17e70a5fa196
font_01_sfnt_off00011828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11828 16816 bytes
SHA-256: 2c74eebba2dfa2556f803481ff1ac37bead32d05a8b74d35ae1386ebd0cd4e71
font_02_sfnt_off0001444a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1444A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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