Malicious PDF — malware analysis report

Static analysis result for SHA-256 be3b553b9a68b470…

MALICIOUS

PDF

80.6 KB Created: 2021-09-01 16:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1388df5e999dfb50e70482b85414b8ef SHA-1: c83d833e00b683a2112b2ecd6b9f1c78ee7c503f SHA-256: be3b553b9a68b470610b30d76d640eeab434df8844d4a640eedaa97623dcd1ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these sites to host or link to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/a448c22474a2acb8f75bb25cd0628060/27177967429.pdf In PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/16f8d2ac48f8c0b993e11671fc4ae841/56499416942.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/e38aed597ed25d1f772b86ef7e0080cf/zukabuzumowigunovaxe.pdfIn PDF document text
    • http://springbook.no/files/4656347978.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fe5252b4e95---50943900546.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/94849094738.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/01a80c9740821f55b54130cceb84eaa4/xufafusot.pdfIn PDF document text
    • http://home-delighted.com/user_img/files/91901629411.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/kurawarexizez.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/bf1f916edb763799d3bd1a891f277b74/zixijemikebab.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f907dc2d591---464929082.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/fikavetudivexifirel.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/jirovudupe.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce99e18c3b---11528312555.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/fubezedagugomilikaxim.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/47372796968.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/v90doeueugs484p4286c5qhj6n/tajowusabigo.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/wotoworutunojomupofovene.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/ce773f58d2b1e0b035b450c83b77071c/12972858024.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/98738766997.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/zawif.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/2725183170.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/fefudezovoviwofu.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/8etbedmfh902ha4q6r47demj09/81733675125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=find+the+shortest+distance+between+the+linesPDF 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_off0000d2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BC 18564 bytes
SHA-256: 4a3031ef779443616d1e41572b66edb50069bd787fbb256ff3eb264ab99e48a7
font_01_sfnt_off00010389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10389 10668 bytes
SHA-256: 4b643ce6a511e4c9425a9dea7570e3a414c716788793c88b24c523d6606391ed
font_02_sfnt_off00011bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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