Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f8726bf50aa460…

MALICIOUS

PDF

84.0 KB Created: 2021-09-20 07:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 011c30975b147854041129dde5f8c9b7 SHA-1: 49d87e20575031325a72f8515a7e88c6085e77f2 SHA-256: 90f8726bf50aa4603011e93fd8680ecb0fdaab91b232e6124d4c07c8eee57103
204 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a ClickFix paste-and-run lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.bnbtravels.com/ckfinder/userfiles/files/nifidu.pdf In PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/77481506566.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ac1464c27---51996670077.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/91954817608.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/firofefuwuxumur.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/fuwuzopesifanof.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/wolegamojaxebafewelapovix.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/naxagejugubikokikizewip.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/gufipowiber.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xobezudutal.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/e8018279fd5ffeafeefccae164dca1bd/63969828017.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/89716285082.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/98888987124.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/purugezaji.pdfIn PDF document text
    • https://grancom.by/upload/docs/5979142741.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16144c84277aa5---jimugixikopiziziwinov.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/76992587893.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/44344770791.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/8es08n0p8gpv7l838j2qa6si50/2283867688.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/xarirozofiloluz.pdfIn PDF document text
    • https://defi128.com/userfiles/files/gotixokipiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=squared+symbol+copy+and+pastePDF 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_off0000db73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38A 11156 bytes
SHA-256: 81b32f3e07bd32cde5e3735f368815504e6b463303a41ffcfe36561bc0a3937e
font_02_sfnt_off00010d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3C 20364 bytes
SHA-256: ecbdc6ccaaf37c4984322615ab0a75fd3eaf2458054baf0c7a1b1187eabd3ca1

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