Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba4fea725880c2c…

MALICIOUS

PDF

77.3 KB Created: 2021-09-18 02:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cff4c2ce7b235620bc8d4d7bc4dbba2f SHA-1: 516091185f060c299ab7eb84adf0eb07ad5364a8 SHA-256: 0ba4fea725880c2cb6d6c4e25a1bdc669a6bc2158471c4e85366739dc8a52eb8
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://revive.fashion/upload/files/vebobasezelemamij.pdf In PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/sefedesivafixaz.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/tolawirisavidawipovasuk.pdfIn PDF document text
    • https://swiz.eu/files/editor/14411901730.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/163191805509891f9bf1bfa1e555fe.pdfIn PDF document text
    • http://erpos.sk/data/files/susogalum.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/58106777073.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/26805858188.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/90943878847.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/87585289386.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/58101224805.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/zujuwawesizomakizinimuta.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/rovafinaxivos.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/81383330726.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/vunubesijanunarelebenomo.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161320c57d3e2f---70043335254.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/gijuxonifuratuma.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/96432364074.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/3d9e7b1dd6eee493cf6dad70ffb0c066/pazaviraviwis.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f342a443c7---tubiwetovitev.pdfIn PDF document text
    • http://yejida.com/userfiles/file/zelilusuwimojeme.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/54082258825.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/48251226039.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/4971793594.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc4d8e2281---liludugovexotixif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=games+for+pc+free+download+for+windows+7+offlinePDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/jugugarujaxu.pdfIn PDF document text
    • 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_off0000c889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC889 17280 bytes
SHA-256: b2ff4a9dd56c12d527244e2caf743d6c35c0f0eeffd8fdf1286902457c28f7e4
font_01_sfnt_off0000f581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF581 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D98 10860 bytes
SHA-256: 2feafdc93172adae55293d58e6af85224a1deddbde64ed20e1c631309d09322a