Malicious PDF — malware analysis report

Static analysis result for SHA-256 f70553d383d154ab…

MALICIOUS

PDF

94.8 KB Created: 2021-09-17 23:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ad2d2a74c8487061b689844885e5f7c7 SHA-1: 01e8e9def4b5b2002ccd1f1d51418812d6cd97b7 SHA-256: f70553d383d154abe9a8fc7ce32630829ba6107d92946d7af62f071e706ca935
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites, as indicated by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. The embedded URLs and the nature of the link farm point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://www.nena-artspace.com/ckfinder/userfiles/files/wutudepadenap.pdf In PDF document text
    • http://kpdb.org/userfiles/files/govodematifolapipusotejof.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/b619efc6020532bb8b5db35939f95a2a/46057077150.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/90527144390.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613326e33a1c6---91059143261.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133b3fc1e03b---19299388281.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109101253397900.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/87081749750.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/toxiruj.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-15/210915074200502688moghnie666y2.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16136381e7d6b5---pijuwoxegedo.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/rupatogawegoximitub.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/bapuvotajume.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/11223680930.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/kuwumajiw.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210906_A6ABCD61BA5F2928.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/59495322910.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/91824448145.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/77229293842.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/14652672560.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/40791587568.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/bemipovene.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/60892721146.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/58237467536.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/48202040973.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/52907351226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=algebra+2+practice+workbook+answer+key+pdfPDF 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_off00010b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B38 11328 bytes
SHA-256: d8e6b0024584de31abd8c1a9dcb8cb09b12e41badb171b588eddc8cdea7e09e8
font_01_sfnt_off000125bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BC 17900 bytes
SHA-256: 675b73c07ec2bce59e8d6b2aff4ffa2286fdf2e7efa0b485cb03bd2bf8e520fb
font_02_sfnt_off000154e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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