Malicious PDF — malware analysis report

Static analysis result for SHA-256 12e5960247bbdcc4…

MALICIOUS

PDF

80.1 KB Created: 2021-09-14 09:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3580c2ea850431d98583db91946eb269 SHA-1: a2a950df79e62844d0c592d7d78839e02ea2a8aa SHA-256: 12e5960247bbdcc49091feffc48e1ea4ec6ca5c2f9d6fe624607e71c8c17d872
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to other PDFs hosted on compromised websites. Heuristics indicate this is a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://krisoc.ru/uplcv?utm_term=appli+gestion+contacts+android PDF link annotation
    • https://shevtsov-art.com/uploads/files/ferefunifamik.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/80184655283.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd27e28b06---jofefulobobexekadi.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/xijaturebamufavobasisimiw.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/91301027052.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/80970922509.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631259341.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/rasimokigob.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/43925631958.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/ae4d6a9cee32ec0226a8641cfa2bd5bc/dekukovowexujawefosiketas.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/8908901286.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/vojixevukoxa.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/sofajegawarex.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/petaravezilolokizawewibeg.pdfIn PDF document text
    • http://csp.hu/editor_up/6037421115.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/mosizu.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/44198059330.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff8b7258f9---37712406065.pdfIn PDF document text
    • http://nessium.net/userfiles/file/burexovabibu.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/molejizidotot.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/92036041466.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/25323440216.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_off0000d3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 10672 bytes
SHA-256: 822bed31fe22de9fcac902af9a18b81355ac3c2f6deadb420222da85bfd4492c
font_02_sfnt_off00010451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10451 17872 bytes
SHA-256: 43e2d5abc20f935640d9f211ca4f7d0f05ab10d430e314b4def6a1d66e2959b3