Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc41600b65e5580a…

MALICIOUS

PDF

90.2 KB Created: 2021-09-12 05:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0d0efcd868ed1dda017c6cfcb1f6dd03 SHA-1: e6ccba8d503ef5fe74fc009b2fec3b4bcf9d474c SHA-256: bc41600b65e5580a7f96da89e1af1b5451072a34f68fe953f4af5a35a68d0308
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The presence of a link farm pointing to compromised CMS uploads and disposable hosting further suggests a malicious intent to distribute or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 https://tvsporedi.si/vsebina/gisemebudanavikaxesume.pdf In PDF document text
    • http://exoticland.bg/upload/files/files/modat.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/tupamowewe.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/54120281959.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/96250404004.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/15d0j8k443om7hvr0hrq14en54/pijitefage.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d61c493ddd---wedumuradapaf.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/25107514758.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/18609375434.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/noriridopupagoxukuvebu.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/xupajosegokoj.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a82fd5d653---fosavasufuxulumon.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/30351068362.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/22066444251.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf8906279a---9830513022.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/bubivefonexumaja.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/21385299302.pdfIn PDF document text
    • http://lamay.de/userfiles/file/lonewiwevibuvapurilibef.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/pedug.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/77819923099.pdfIn PDF document text
    • http://dmkert.hu/files/file/44101603034.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161373e2a103bb---vozabusa.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/vedanujosizasixapetotav.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/gidolatikus.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/nabup.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/zebogaguvijoxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=multiplayer+games+on+ios+and+androidPDF 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_off0000fb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11313 18100 bytes
SHA-256: a51180092b1cbf9a89e45c8ce5120eb776d4fa9cec18422081eb6f3c0b778250
font_02_sfnt_off00014232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14232 10944 bytes
SHA-256: fec537454b1a54526c074a8f85d7e4708c8e18676e0563e61d41d90ef2e1442f

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