Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8463ffb0eefcc66…

MALICIOUS

PDF

79.4 KB Created: 2021-09-16 09:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 58dead3b0bfabd9d3a4ddd5ba239e504 SHA-1: 3cbdd0c2cc6f514a0547d55d9655e09eb2183db1 SHA-256: e8463ffb0eefcc660e8adf276c54bb95bf70443c1c77e50ec82eeb646bd945ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm, with multiple URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/g68g7fo2er3qiu1mff73bioaoj/xovepetomoxusuzixodalo.pdf In PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/daruburuzoro.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/parababowupeloxa.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/nekikolixu.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/wixovevuvozomawetijalefu.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/nizilinagadetiwefuf.pdfIn PDF document text
    • https://ags-car.com/upload/files/jalimudedakofagexufaju.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/ruvurub.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/bamajesepediruzogo.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/32559674099.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/tovima.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/70512900915.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/70357187388.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/07090411699.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/povesulobikatevulexes.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/vonenozuzapenefuba.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b546fb6b38---kevuvajijir.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136729a3b846---fegogupig.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/lapif.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/25828797550.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140dd26294a6---vewexaridatafama.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/mitezujekovewoze.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/22009298436.pdfIn PDF document text
    • https://hse.tw/upload/file/satuwozafufonazu.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/e9e1ccd0e32026a0ad05635609bb11d4/vuliberedumutaletubij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+phone+book+residentialPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/64616153277.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_off0000d31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31D 10684 bytes
SHA-256: 82e98ada452c7e65385c5761ccf5c59968ec331b5b838d9cc0cf27df12cf26d5
font_01_sfnt_off0000eb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB48 17068 bytes
SHA-256: 30288c8fce6c66cb91ebd2aa17b675adddf6c8a25bc39db5bf183e6374248ad1
font_02_sfnt_off0001179f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1