Malicious PDF — malware analysis report

Static analysis result for SHA-256 91bff01b9f07b99e…

MALICIOUS

PDF

100.7 KB Created: 2021-09-16 22:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 80903dd157bd862f201e13846b3c764c SHA-1: 75bac6aaf160a5ea5a3c9a4c5a14840b416e1c6e SHA-256: 91bff01b9f07b99ef6aee4fdf241abfae32ae684dda53081872b1630e483eba1
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised or disposable hosting sites, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, as does the high ML_NYX_PDF_MALICIOUS score.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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 http://volamthienha.top/userfiles/file/kilevefixutedibax.pdf In PDF document text
    • http://seamacros.com/upload/file/22230566608.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/95417985057.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/mikafakukurimuga.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f52de5c7f4---ruvoboto.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202109070201578966.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210912040856.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/ruzogirugokemokijilo.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/tanoweluridaw.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210910052003.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/57299059640.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/voravazag.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/78113326013.pdfIn PDF document text
    • http://kalikraft.com/images/file/bazomobomezakigom.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6e8860aab---64572006134.pdfIn PDF document text
    • https://melz-feu.ru/upload/nonaligakem.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109011552485826.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/nogaviluluvu.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161403c028e22c---lalanazabawuberek.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/be87312d744443aa216d2bd93fceed24/69105594798.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/wujer.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/50483149441.pdfIn PDF document text
    • http://ucokampen.com/media/files/86283068883.pdfIn PDF document text
    • http://hasyo.net/files/file/tudetomanu.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210907022356230106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=justice+league+part+1+full+moviePDF 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_off00012347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12347 18636 bytes
SHA-256: 23d8d2d5b3c8983151eb15b156f9de0fd0abce426fa5e5b9621a8856c8e4667a
font_01_sfnt_off000153fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C15 10928 bytes
SHA-256: 2b06b51bae4f2519925cb9d64d84c8edae7ef7f7e918ef0835f93280eb77c507

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