Malicious PDF — malware analysis report

Static analysis result for SHA-256 17db0c930b37258a…

MALICIOUS

PDF

71.9 KB Created: 2021-08-28 01:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5790c33fc0b0f592533552be7b213882 SHA-1: f2c0f1350a501c8467feb16bb1e250f33d06aae4 SHA-256: 17db0c930b37258ac00ca0dec0b791271bd8efc701d01c3cfd30b5db67374975
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://irish-setter-zucht.info/ckfinder/userfiles/files/dilomi.pdf In PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/0a97qf93070d5n6shl66f58dl1/71561366028.pdfIn PDF document text
    • https://digireg.cz/upload/dujefuripubuwexopugudodu.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160af2beec0d76---56983245959.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607975752f1aa---deliworonerewab.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0993602f01---70343512294.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/fimuzirabelolo.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/20602766231.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/c3murf40q2f5uemq04csunfv64/supodovunuvejiputawikebud.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/wovemevufetiga.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/tofukitisisedovawezeko.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/57013401506.pdfIn PDF document text
    • http://itena.si/uporabnik/file/31664734244.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/wenuzasojusuvivosegav.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/vuxigepinanaxo.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e65ff9acf2---fejazur.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/zepojirijuzokejizipiwubas.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/56841667820.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/18030439334.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/53343347942.pdfIn PDF document text
    • https://petala.gr/userfiles/file/74852386766.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/aib7h2l75jsj1a3d4oumv72ro3/35990607193.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821e2c1330e---dinobomanusijisor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=suppurative+inflammation+meaningPDF 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_off0000badd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBADD 10772 bytes
SHA-256: 04b157126de0d00a017a4a289c74f0e5803333daab14919100ae9b51201cb8b9
font_01_sfnt_off0000d3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AC 14844 bytes
SHA-256: e62b485b77fbcf11ec077546695da165ff993ac6f353c0a0c0b9f08bcd230795
font_02_sfnt_off0000f942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF942 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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