Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e4f471f27c1f18…

MALICIOUS

PDF

79.6 KB Created: 2021-09-08 21:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b13d65e33ba2397409f3b8a7e6307f38 SHA-1: 98ca6b2471e8f29d2e6d25f1fa9345257aafe279 SHA-256: d9e4f471f27c1f18a06633583f3290715943652a3e8ebc8bb1523026f4a04632
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and a link farm pointing to potentially compromised WordPress sites, suggesting an attempt to host and distribute further malicious content. The heuristic 'SE_ENABLE_LURE' indicates the document likely contains instructions to enable macros or editing, a common tactic for malware droppers to bypass security measures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16135bb5bdc26c---siwilevediwexuzusug.pdf In PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/zisipuvajetabupilovoj.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/satas.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210906005914_1556506929.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/vanuxajefolabuzexofem.pdfIn PDF document text
    • http://status.cz/UserFiles/File/16572673951.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/wikuboxevil.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/2905335690.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/60962136126.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/57365140149.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161336798ea7b0---fomezow.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109010708256201.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/46963550312.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/f07ca6c612191214500ea9416cfaca3d/suxejudade.pdfIn PDF document text
    • https://ksboutlet.com/file/files/jutubulejobepebibujife.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/tugamegepadifurakelelu.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/4ghdq2ad8pqfq411q6aub4h742/mefenuwasediveduxix.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/lutiwini.pdfIn PDF document text
    • https://laser123.com/geektic/files/sipufowiwiwez.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/rozixabuxiwilurejadim.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/5f972ed1ccec6fe08b725b3bac4c091c/jegese.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/11223218594.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109061901243521.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/milarisuvenogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=excel+vba+define+current+worksheetPDF 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_off0000d1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EF 17164 bytes
SHA-256: 3bfad95b20519f01cd59d63b10d6cf97a4df22f81e9e77047373a0263b854ae7
font_01_sfnt_off0000fe8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8B 11144 bytes
SHA-256: f9626805317135cccf5a0ea74df0a1cbad8e89fa68cc5e3de2e8672597732ec3
font_02_sfnt_off0001189a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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