Malicious PDF — malware analysis report

Static analysis result for SHA-256 259f0895fd21cb7f…

MALICIOUS

PDF

76.9 KB Created: 2021-09-19 04:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: de298b271960830ce04e66a67e4e037c SHA-1: 000d7ca1ffebb65e6d34f5e56bf3a0fd50dedffa SHA-256: 259f0895fd21cb7fb8bda8998a30885642d34d3ab1278cea712416d890614cbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs, some pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the overall structure strongly suggest this PDF is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=hacer+pantallazo+en+samsung PDF link annotation
    • https://stauber.lt/images/files/sutexiwuk.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/xukajorenegagerev.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/273fe6c5ff7664b9a119045c2f667f24/55397325651.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/16310080372829845216.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/wudobaw.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13582269463.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/favegiwapax.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/guwefo.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8a116ba4c---46577239498.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/fac68813de6c0957404af4744f573d99/37329148229.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/depenexejasuwolil.pdfIn PDF document text
    • http://osayit.com/images/file/serop.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327f259e1a6---49124168879.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/3658900762.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021090816573673499.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/32700366622.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a1f319518---jiputajarakibi.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/35362834488.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/jepez.pdfIn PDF document text
    • http://jiab.net/userData/board/file/80082238024.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/mowububaju.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/2089578bd25a99b1d23acc5f6d330ba8/20382591830.pdfIn PDF document text
    • https://mkart.it/uploads/file/76025140615.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/52263104397.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_off0000c82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE044 10776 bytes
SHA-256: 43c59580b21840736f35d4888ee269ea0672da94404e6b1415244a5e72a4ca6e
font_02_sfnt_off0000f913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 17824 bytes
SHA-256: e31ec9ee8eefa03af626fc54add04bf490fe5ab4dfd1d9fa21d3b35b9670b016

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