Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3e6968391b93b8…

MALICIOUS

PDF

80.8 KB Created: 2021-09-03 05:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2802c061549ccd649286df7fc67e466d SHA-1: 0133afcfff76482e3e5cfca49d0e1ccd11b27991 SHA-256: ef3e6968391b93b89bbb5a5b4f7862c597e2a5590ef089cd5a346b7d00fc9329
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of links, many pointing to compromised WordPress upload directories on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are likely part of a link farm on disposable hosting, suggesting a phishing or SEO poisoning campaign. No scripts were extracted, but the presence of numerous external links implies an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16076b82aa43ad---22941111746.pdf In PDF document text
    • http://panziofabian.hu/fck_kepek/zefewabuwapapazirobasuw.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/1e802dfc35b29bf851c91627a3a805f9/katudilojo.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d378cecd21---wixujezunisamilotito.pdfIn PDF document text
    • http://montesantangelo.it/files/files/vifuro.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/dirole.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607243ecae854---vivara.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/a3ae13c89841b4ce297a7942b8518560/jowugiregop.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a4499520c---27685895528.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/7475027433.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/1ec9a530c8f7151b396d07872ad2e99b/seruj.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16121aede4dc6f---55890212017.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/gumudugaguberebibif.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/55207680757.pdfIn PDF document text
    • http://chaplains-camps.org/upload_picture/file/51068747833.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/5313d8bbe6619c4cdbc37d1eaed8e711/41364266750.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/feregi.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/sefuteze.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cca3041a05---54979662675.pdfIn PDF document text
    • http://haltia.mx/sii/ckfinder/userfiles/files/85151124182.pdfIn PDF document text
    • https://activepymes.com/pub/file/62620251994.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/fn0i8bkqvvi15ndrglk9266a33/vagoxen.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/39502232898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cambio+climatico+2019+pdfPDF 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_off0000d5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B2 18032 bytes
SHA-256: 12152d077490073ab5411102dd658de6a68235e551d7fdd57a66d5599e9f7700
font_01_sfnt_off000104d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D0 10912 bytes
SHA-256: eaaebbe7e8234cd038905f97d6543a1c8b5e27ddb1ea7804364be079d27322de
font_02_sfnt_off00011ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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