Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8eb2baa7a41083…

MALICIOUS

PDF

72.4 KB Created: 2021-09-02 16:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 76bfbd2f13bf0badeb8501efe53313d5 SHA-1: a916959ef3dbe38dcc1e84c53408256da2a07dae SHA-256: 9b8eb2baa7a410836091bfa19b10df3f703c84f24b2cce849606958ca18eed6d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and numerous links align with techniques used to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://huntic.ru/uplcv?utm_term=convert+pdf+to+excel+using+uipath PDF link annotation
    • https://kisikana.hr/UserFiles/files/89024088478.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/rarexemawowidixowagog.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/5098500046.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774ddb853c9---64450977820.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/13152107465.pdfIn PDF document text
    • https://makanbanyak.net/contents//files/66886584652.pdfIn PDF document text
    • http://monroehighbeachreunion.com/clients/8/88/88bd109b8fc96949fe6caf7698e88fda/File/bezaluwomizog.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/916478552.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/riketejojowemozexaforidox.pdfIn PDF document text
    • http://alltechsro.cz/files/71732339693.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/57614033581.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3ba1bb618---98017300805.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/pipekajilamel.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202108190024562279.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7d34da9ec---89315831293.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/mogikoninujunota.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0ccac5e25---73270743812.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb740787206---zifexafiralixuroj.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/87173154579.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823929afaf9---47413046436.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7a438a656---79373800945.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/radefavubevezuletijobube.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/roxiruvidimusew.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/to53lmbcai2jcpaetf6a6v4h07/nogurawebotesulomuzot.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a577507b01---dowetomafa.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/jepovem.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_off0000b993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB993 16036 bytes
SHA-256: 955396ef6e14302ec877a6d6f39e835be222abd31d6063a9defbc387141078c1
font_01_sfnt_off0000e1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F9 11196 bytes
SHA-256: 82ee376c8aeeecfa6c92935aa1fdf7e95f9c87baf59511fccc76470820052fae
font_02_sfnt_off0000fbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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