Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89730c9a69305a3…

MALICIOUS

PDF

82.9 KB Created: 2021-09-06 20:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9fd96ef8e5a773fdb15b16d3eaa24321 SHA-1: 63cb82e592236a32873ecba180451689515bc97b SHA-256: f89730c9a69305a357489f5654b03693c77bff0d241850a3c992058baafb3a18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous external URLs that point to compromised websites and disposable hosting. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=fusionner+2+fichier+pdf+en+un+seul PDF link annotation
    • http://hyunbulsa.org/~ewedd2/userfiles/file/dubisetetegonapesu.pdfIn PDF document text
    • http://moristas.com/userfiles/files/66927451919.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/demujarumegazuzotur.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2eca78ada---lufuxafirofuloka.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/65013326162.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/wifapoxamoxigudiganowi.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16093f61178220---fixuj.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611779b122861---nijure.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba2918a2db---kixoxisoxakevenidom.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df4ea8d4537---79353671757.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/roteridukinikonijumug.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/bavikivapejiguxawakudaxe.pdfIn PDF document text
    • https://nilsagame.com/calisma2/files/uploads/towejuxa.pdfIn PDF document text
    • https://pecsikult.hu/files/file/19682489729.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad3632144a---57094781492.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e28d429172---podiporini.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/luzoxukopato.pdfIn PDF document text
    • https://preciseenergygroup.com/media/34538945876.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/kagifasefuk.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/e178256acd94cd4b5c295a49d60a7039/gufuranerezibi.pdfIn PDF document text
    • https://artbynela.com/uploads/file/mipidajefomofifeb.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/54737079772.pdfIn PDF document text
    • https://mfdesign.hu/files/file/xopuditebana.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/95843470569.pdfIn PDF document text
    • https://www.commenIn 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_off0000dcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD8 10652 bytes
SHA-256: ce3b53353c0707399217377806a049b9ecfa85306d5f57631a72dcd1593601ec
font_01_sfnt_off0000f520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF520 19192 bytes
SHA-256: 0c4d8569d75522dda7dc68f5bd4e6b3dbbbd652672b7aff933d485bd7b5dc869
font_02_sfnt_off00012572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12572 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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