Malicious PDF — malware analysis report

Static analysis result for SHA-256 4316383d3be41ceb…

MALICIOUS

PDF

107.0 KB Created: 2021-07-03 11:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a5860ca850c43c9168f6dcff04930fa7 SHA-1: da01206802632fd1de75d00edf505b61167a6a85 SHA-256: 4316383d3be41cebe953d7ea6570eb2e848ced2d8bd21fa85e45386ae770ced2
196 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. A critical heuristic indicates it's a lure for clipboard command execution, instructing users to paste content into a shell. This strongly suggests an attempt to download and execute a secondary payload, aligning with common phishing and malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

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://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d48d0003a5d---29407898269.pdf In PDF document text
    • http://champaigncursillo.com/userfiles/file/7432082614.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/v1qr1v2qfrqi52v0f27bjqe119/42271075048.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/a6e9ba2d7865eb5c1db3658fafe5690f/gudafuzijijubamasomi.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/pcdc04d992rq0g7sbqso3i5k8s/38639977846.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/rukopabudisapen.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d55a0d3b05---ledibaxis.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607ded7b47b61---sibolekimuza.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160805805bf4be---49873736362.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/mitikosevajajuvovofa.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/4tie81t86l7s50mplc0v31jq0t/noxodirefajov.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b2094e85307---78471294586.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/3cgpgmk13o1d5heudhf8lh99k4/xoxoxegasiwexak.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/4kh94ja862drp5hm6ede1bh752/berosudefomavinelitufa.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/mutur.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098950db11e3---22073828093.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/xigezuvosamofawudimoteb.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2096eafde---lepexepexokunapakel.pdfIn PDF document text
    • http://markone-tools.com/upload/files/vetutulapafokabik.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714c3c8dc0f---jowixesusikokivume.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/00c55abccd262aa215e6a6f13d38d93c/94645557154.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec70c2dc88---gulojerixemifo.pdfIn PDF document text
    • http://aimic.com/userfiles/file/97603359851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=shortcut+key+for+copy+in+computerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001268c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E9E 18920 bytes
SHA-256: 0a372ff3f6ce35df468d977d1fae9abb604d7e39507b215769aeff08eb81c350
font_02_sfnt_off0001707e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1707E 16112 bytes
SHA-256: bb32c68aaf9d83371a175a7d70fac57272117aa1623b71625c85e21b532290c3
font_03_sfnt_off000185d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185D6 10748 bytes
SHA-256: ae866a0b1b55734a10a202a7543d0e307b65fee04075cc7820b2df4212633511

Open this report in the interactive analyzer, or submit your own file for analysis.