Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4cd8785f4dbde27…

MALICIOUS

PDF

72.5 KB Created: 2021-07-18 10:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d13ff0ac088cd5753c99a959134fd6b2 SHA-1: 2d7878842950615dfc61475c4139eff314bd56b9 SHA-256: f4cd8785f4dbde27ebcc3edae059a5d1a7c0a1709a8ff8768e4e899190ce2f14
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. The PDF also contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious destinations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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 http://derkwoo.com/upload/editor/files/nawuwodulozigefivig.pdf In PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/3897294114.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dea760867a1---71094516622.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a815b113dd136c734dc2e2bb28f76420/45991354529.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc104969e4---41615816083.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/nhf9vvfqf8f9bun81maf9e4cnu/xupinikibimokoxag.pdfIn PDF document text
    • http://fructusartis.com/i/File/jefewixakaku.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b473530327b---gawovumetag.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/98304373778.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/70310181160.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a26c6e7e755---lezuba.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/0135cbrsqsmhrm74ok60c1tr73/fegesinos.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/guguroda.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/f0b7e40d761953555e7d8bdfa99c32ce/15118181261.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830a047b7d5---76472730624.pdfIn PDF document text
    • http://alumnicollegedelunion.org/clients/76066/File/95431513768.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/xagutujimolaf.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/a49r65dcai0q16ujoatf9tgr1p/kumatatulodumokuwujujijo.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/lajebasupixebufik.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/87d53550ab85c1c1bdfb8c5232731cb7/17774210688.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/b72c6c595f187b89598f7c44192fb18d/jovosagalodedezeno.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbf378bb8c---93913648040.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/zuxuxavopexapede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=seafood+en+papillotePDF 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_off0000be60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD677 10296 bytes
SHA-256: 79c62f3ce37b61794986a4e7215bc20335207ada620997419fc8360171e982ed
font_02_sfnt_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 15528 bytes
SHA-256: 7cf97017b5484a65890af5ecd18148bae9e3fa1dcf3101a62f283d6d7f8b47bd

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