Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8ba147ea656774…

MALICIOUS

PDF

86.2 KB Created: 2021-08-23 11:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 54b7035523c6771466357f8633735549 SHA-1: 5aeef98011675ad2346a6ee3731429fc771fb439 SHA-256: 1f8ba147ea6567741f6ce1ea42ecef5be08fbab52b657199ee68de5241c99a3e
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external sites, many of which appear to be part of a link farm hosted on potentially compromised or disposable domains. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a command-line context, a common technique for executing malicious commands. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://mt-creativestudio.com/ckfinder/userfiles/files/topidetitidebuzaxubizekas.pdf In PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/c162e5f04567b28a9ff18bdf3de959f1/xevogowoteruvoxemubulu.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/48460090046.pdfIn PDF document text
    • http://standrewsparishhighschoolclassof1964.com/clients/70428/File/rudegavenejoxijisad.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/6r2evggrq5ppjgpnk6t641j6ts/4161697061.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/f80f3ce5db68c7026348c48ea93a09c9/tedomoditaleluwerax.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/c9b232833b5261fa730208de2a77cfd7/mexemerasesu.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/wuvelowekumakajaziv.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f6939ade45735d89f1c42b47473d319a/59708555903.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c163135a919---33010129685.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/biwad.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/92792051306.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/32357323296.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609954f8a74cf---vegagovenuwijijabewaz.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210703_142428.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608c38f609824---kurolisifisuzijeburabona.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0980616001619772547.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2553afd26---jugiluril.pdfIn PDF document text
    • http://punaide.com/userfiles/files/zexix.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/16714915486.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/3236896807.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc92479e45---tabafifakerugokuperipa.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210606195553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=chi+in+kung+fuPDF 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_off0000f0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AB 9892 bytes
SHA-256: 34b0df075d1cc15ccb51655b1c384941f4d7a9d3be22e452bc8d0543b13874c3
font_01_sfnt_off00010653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10653 17012 bytes
SHA-256: 979d9827d93831119d2265f8961a54dd172cfd7310f174d93c3ac24347d418e2
font_02_sfnt_off000132f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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