Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c05d2ea22b1372…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 22:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cbf5372af1ef48844719b45f892606c5 SHA-1: 348fdb914e5d3f0f85e81b769ae6c2f4c9950761 SHA-256: 59c05d2ea22b1372555930adddb39064a5179ce254f1e9c448f272348aa2b4cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms, with several pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=best+free+attack+on+titan+games PDF link annotation
    • http://newabel.com/ckfinder/userfiles/files/10135820957.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f15245808b---31798233043.pdfIn PDF document text
    • http://ruihuitax.com/files/file/6104688482.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132e2d507e0e---23100484263.pdfIn PDF document text
    • http://trivio.it/userfiles/files/52801262849.pdfIn PDF document text
    • http://mqskin.com/luutru/files/migururotivoxawos.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/tilumufonubesufexoninut.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/oj6tjvjd8qqlotim67vrb54o6g/vijariduzuvirodawaxer.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/dusapenopevitijozi.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16136d43716d60---76830138211.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163155404849.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/masuwe.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/17605887771.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/kalulovizomipixegur.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2e9c12382---vonapunusawoga.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/kogiwo.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e68da68c0---deteji.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/webokivubomijojawetakivup.pdfIn PDF document text
    • http://domosplast.hu/files/file/80082974108.pdfIn PDF document text
    • https://www.suep.gr/ckfinder/userfiles/files/3030789140.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2dbbbfba8---birasipunivimunap.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161466ebf74842---95876223009.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161441b3a9bfbc---2694400827.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_off0000da82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA82 17432 bytes
SHA-256: c189007c006e18cb8eeb065132cc2047c9373290569c3c612bf668a372e8b80a
font_01_sfnt_off0001077d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077D 10780 bytes
SHA-256: fdc8664ae48bdfdb221e0ee9924fb56310735fc80d3e9ffc45c0064d774ac8fa
font_02_sfnt_off00012067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12067 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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