Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a42545f095690d…

MALICIOUS

PDF

89.4 KB Created: 2021-09-04 06:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a947f0526597100c343b70b25c5bc497 SHA-1: e86f3518901e663d61ddfc90da5e8257a8c43b43 SHA-256: 55a42545f095690db1144ae46a69523b3beb14f46d980eeea87226d550730f6d
196 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. A critical heuristic indicates it's a 'Clipboard command execution lure,' instructing users to copy/paste into shell contexts. This suggests the PDF is designed to trick users into running commands, likely to download and execute a secondary payload from one of the embedded URLs. The presence of multiple links to potentially compromised CMS upload directories further supports this attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/f27f74df08ebe51ee2ce9b6efbbd7424/24642550707.pdf In PDF document text
    • http://cosmoscm.com/contents//files/94513621675.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/tujeraribomob.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/92f35235d23e10d9797da7305ccecf14/96203339978.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1ef33deac---7213280608.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607455c14d649---77040872255.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a05ff75bec---56779345169.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/30350571509.pdfIn PDF document text
    • https://beaszemin.com/files/rubugamekojexepowe.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/d70211830e735c9b0a6096debc4a8def/67350819014.pdfIn PDF document text
    • http://gapp.fr/medias/files/85490459604.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/ockv2pum8u4k8cmc2p54j1n773/10722143880.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/minamadazivupusufukorel.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093a20c4d3b8---92750746801.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/49851627995.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/69728237792.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/00d6596282260f5e945d29cc8bba2994/widorilivasonenoverikul.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/7f0bdsoo70e7e134ibv1ptaeko/pupoxuradufuxadikimaluwag.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160888691e9b65---69353925203.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607054ba3531e---73875644475.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b22c1ba9067---bufogebataro.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16084a74feaaf1---37786730691.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/7362904260.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/30930975820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=pvc+msds+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_off0000fb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11394 9996 bytes
SHA-256: 338a29268a3e9678935d122b7e5fb04deeb6b925e1e6cdfd219bd8043b870d9f
font_02_sfnt_off000129ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BA 17764 bytes
SHA-256: 933e9bd41f8903ec6ce7f1644c7050dc770a10bdca2bd76f85ca2b7b65962c09

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