Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d40e68a69156bed…

MALICIOUS

PDF

84.6 KB Created: 2021-07-02 21:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4cb3878f2ffaa3d8d5c10a1d52dc28ce SHA-1: a51d789b0a703c73aa8dda658d3fd9d6e949c441 SHA-256: 3d40e68a69156bed5810d4f6de70bcc172c4472829b6d4ec02695f3edacdcf78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The sample contains numerous links pointing to compromised WordPress sites, suggesting it is part of a phishing campaign or a distribution point for further malware. The ML classifier also returned a high confidence score for maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/d401403f0b8a90df3a83e651c4e88a23/10110267839.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba7c47a703.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/9efb70e23f192024f15cb12c1cc0680d/nuxipemekatiwe.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/36456275534.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a758a9df6dd---zidibamo.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a4be5eff38065fb7379740fcc38be93b/voguzowavozuri.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/mozibikezekebe.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e6c167251---zokonuvemenajadizeli.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2140312db582e59f9ea3cd5761634b35/74832581098.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/73772676040.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8082760423.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/upagtafbdbhl6nhulk49jvovl3/56786300163.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fff35a74e---30455207917.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/77086459531.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/56772158354.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/18657560664.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/8690a380e6744e9176f16ca433259b1c/95318640056.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a62519e8295---kavoruwabawojejejiwosov.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/2455347603.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/47666635232.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/435eaf6ba1742efa29ebc0753f1ed420/55384318886.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/28589cfqu81a8q4mjapj4njo1a/tixeniluwiv.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16199002034601.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16092abfe12f5a---76566043699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=remuneration+policy+for+employeesPDF 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_off0000e796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE796 10900 bytes
SHA-256: 85d51e515846c1f01c9199c2debfa36751753b7067a8b33ff15938d454824ee5
font_01_sfnt_off000100d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D5 16944 bytes
SHA-256: 6a3de31b2c8e435ce5160524838d6454a9c55e1cdbacfe9d19f8e8950e35f95a
font_02_sfnt_off00012d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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