Malicious PDF — malware analysis report

Static analysis result for SHA-256 d10c5398390ec19a…

MALICIOUS

PDF

74.7 KB Created: 2021-09-19 12:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4db94d0288b3409f9bdee25217ee7591 SHA-1: fa410b75c3d314e40ae5dc94de4716b1931bb719 SHA-256: d10c5398390ec19a5043faa2e5d7c7219060fa41ea11fc62ea1ca988333e403e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URI heuristics and link farm patterns suggests the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://inwebjor.ru/uplcv?utm_term=psp+gold+game+download PDF link annotation
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614655a73806f---44562335157.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/52225884275.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145aaa3894b7---22473152194.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/26937445912.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/zobizokasop.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1614534f50fa01---48862057006.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/85560151274.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/vojir.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161410f8ce07ef---38359278848.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/kfnoitkd6krtvj48flk2o4rmk6/77124395998.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/37573643757.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/17471480167.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/97098028159.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be9c3a509c---jumepopuribalutev.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/15368393631.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/gejilogoparivuvorina.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/xipaluvatapufivurisim.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109081805554376.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/e534d0309d658f6eb1a5014bcb4d1718/66343444295.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/lopixogoniwenageke.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210916222508.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210914_31B50065DB6D0A0C.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_off0000c142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC142 17176 bytes
SHA-256: d8aebcc7a8fa967e719f60244f114522a659b508a9e8e0d0aeb35d869d6a168b
font_01_sfnt_off0000ed89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED89 10532 bytes
SHA-256: 8b165bc19dbc8a6499bfcde94cb73cd5a0779eab88b7ef7128914c84c6ab839f
font_02_sfnt_off0001055e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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