Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e7a3fa53d581d3b…

MALICIOUS

PDF

112.7 KB Created: 2021-09-06 04:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a2f51d487d2a40ac7760aad906500ebb SHA-1: 41b6a416e82386834eb1ae42cf2a2390adfa7bb5 SHA-256: 3e7a3fa53d581d3b89d1bdb273913acaf41b722123b235dfbcff24b43bc0cdea
196 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF document contains numerous links to potentially compromised websites, suggesting a link farm or phishing lure. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a command-line interface, a common tactic to bypass security controls and execute malicious commands. This behavior, combined with the ML classification and ClamAV detection, strongly suggests the PDF is designed to facilitate the download and execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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.
  • 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://benetworkingpro.com/ckfinder/userfiles/files/31458267282.pdf In PDF document text
    • http://feuerwehrobrigheim.de/upload/files/zolosirumobevufigonejidad.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/ptk252nk4vgv21r65fvb76j3hq/52984449158.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607aada5166a5---xizelefodizedevabudis.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/jro1cog2l63odhu5a7j0mg8uv5/89022554055.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/lobopuzob.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2b1c672f8---44259941383.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b365a73a636---gomaxogusagekube.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/50910854886.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/97909836721.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d35cc7f69e---zojivusagevoj.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a091f2f40d9---rukixavodila.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/36662779178.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/41203055750.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/49184719064.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/661c7314026381ec7b27b218b7b28f24/42240813924.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/xibofusarovubagunulojipig.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/h7pqd3kksng8ai0oul6j9ji254/livitol.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/zotijararitenokodosinutu.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612c2047969f9---31025327969.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/jimelegewujovekofokezov.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160d872f1ea330---30160752354.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/35e3ddd26f51639cfc6dd459c35ce5c8/20934497192.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/fuvekubuxodixetige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=rslogix+500+training+manual+freePDF 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_off000152d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152D0 11060 bytes
SHA-256: 8cda617163e231136d8c4d79a055b533e1aadc3539dfc2c3fc2ff0919b062a1a
font_01_sfnt_off00016ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CA1 18656 bytes
SHA-256: bb7cd1a090327842f279cbd934b60dec63a5e52e3a7e22e24f4573a3810b24b6
font_02_sfnt_off00019d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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