Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb8fc445cc9960a…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 18:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 88f557fd8c7efb6fdde5ed8f7fb24fc5 SHA-1: bd23d2ba9157a75d173bdbe712d2dced98058716 SHA-256: cfb8fc445cc9960a62387d9c671eb3fc5376360370794d8d99d5d8d9750ec74c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://chanakol.com/ckfinder/userfiles/files/83013912829.pdf In PDF document text
    • https://linhngapt.vn/upload/files/kisutidupoxegor.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/4154134272.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109121649091134.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a435579c---nelewaxizosuxumajoxuwumet.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/b5f8ab51adbca6542cbd636dd18cfe0b/xolunuxenabekin.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/24640262461.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/5590522793.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/jusoxoxeruxe.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355b473f3fb---73777003694.pdfIn PDF document text
    • http://japhina.com/upload/file/warisix.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/29634742692.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/19998493627.pdfIn PDF document text
    • https://eclearusa.com/images/file/78603565393.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/tipol.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/fba3c61cb551b1f96ef3c01d089a3b28/fukelilefisedezivi.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021916_20956_626.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/nozazinazu.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109041128338924.pdfIn PDF document text
    • http://home-plast.ru/foto/files/konivawonegozuvedamadofot.pdfIn PDF document text
    • http://harlit.com/upfiles/file/vogezezifagiwukupe.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/21941287896.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/57781217477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=descargar+juegos+de+dragon+ball+z+para+android+apkPDF 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_off0000d422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD422 11116 bytes
SHA-256: 1434c26c6bb6662d04bb51400f8c1c8ee3d071fcd7867173ab7da2fc8b8444b2
font_01_sfnt_off0000edb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB9 18300 bytes
SHA-256: ed579cfc9efd99d724a600814324e380f7dd48c65d41c374c60df0bf808a4dbb
font_02_sfnt_off00011c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1