Malicious PDF — malware analysis report

Static analysis result for SHA-256 f599ec14c08dd525…

MALICIOUS

PDF

152.7 KB Created: 2021-11-11 22:59:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b35c42c35e172ea56c6d9956e42473a3 SHA-1: 341aa72ee9d02abc490293654107cbcabde67c98 SHA-256: f599ec14c08dd5252d76bf3fa21f9bc3c41c766729c57f25cb40912a3de172ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, several of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection indicate the PDF is likely used as a lure to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://drafthe.ru/uplcv?utm_term=young+jean+grey PDF link annotation
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/n5pvcnqiev990erd16is7bg2m0/lubanofizubuzinasamudakid.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/ninozipikasolo.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/ruzalunele.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/babopamedamoberuzalirux.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/fuxuwuj.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/8383451625.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/c3f95eeac948f440bcfac353d34d0fad/96347103205.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/43766220524.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20211029130327_352zgp.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021092203124912279.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/6618845956.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b6e0e6823---63674190572.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/vowoleb.pdfIn PDF document text
    • http://www.sczct.com/up_files/file/vafexorisijuridolejuz.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/xuvopib.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/292375383.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/jujigosinob.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/79307253824.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/zitotajagukerobojipatexak.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161456b84352a9---zitativupepodesewasero.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/fabedebowika.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/67332239075.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/96778198515.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/57111949870.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_off0001f258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F258 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_01_sfnt_off0002097e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2097E 10208 bytes
SHA-256: 9c3f0d4f00d8a9ed72275ea93106445da7c7d17f9eb1b36eb2a54f16c6c2a0a5
font_02_sfnt_off00022083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22083 20032 bytes
SHA-256: 01e16e92d8c82c553c434ad7980187a296b56b631300ec187acbc299d2995117

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