Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d6d4c5ab31e09f7…

MALICIOUS

PDF

89.0 KB Created: 2021-08-07 17:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3bf8340ca818810998793f46451e8f9e SHA-1: e8d0048efc41ea2bb61a6fa26a46baa0162cf5ee SHA-256: 2d6d4c5ab31e09f74b3396044a2c8f9212fe6c66d0d6bef9749ae7e454514581
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, designed to redirect users to phishing or malicious content. The presence of a link farm on disposable hosting and compromised CMS upload storage suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://coretry.ru/uplcv?utm_term=exemple+de+questionnaire+pour+%C3%A9tude+de+march%C3%A9 PDF link annotation
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/bd7019a3ece3fcc45fcf053c51862e38/ketenupinutotase.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/24732141980.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/ab7dadd9df25cb72715f6e5efc74938f/bizejiwiwumabuwibexux.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/jexokupifipaxofazikeduvig.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/46269635823.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/pikunokepupe.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/0f4bd3f150d9479dc1add8dd2865bc23/39303224645.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba6f2b6c7e---94860126622.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/ppj7g3comh3ilrutuimo846pr6/wadikuzejivefono.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160edb4db5101d---robulironinegin.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077172d59bc7---31795038818.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/88621078328.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/1nqe5v45evt8vu890ei5t1ln00/pufax.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607328cb94e2d---pixaradiluzezikebat.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ecc69cc8d3db5a23f270313d9fef8322/kerekemisuzupopuveba.pdfIn PDF document text
    • http://shesob.com/file/files/40478842036.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3d82cda1e97c2d094a12f78603121a28/68776151318.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076c0982273d---kolibegenadivomolovazo.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/nenasolepupifeposavori.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/7308189475.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085597671b60---boziv.pdfIn PDF document text
    • https://makanbanyak.net/contents//files/44163712080.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b71d5d2de5---vafovurulifugoveviduxofa.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8bac460cf---rimamekadevelazimaforowa.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_off0000f50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1D 17692 bytes
SHA-256: 616de81d6230208e0e3ea9aa504b08f843ee5f675c78a0cc10c84751d681ddb0
font_02_sfnt_off0001388e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388E 11264 bytes
SHA-256: 90d8cee0d868376ef0bd0fcfc1053ad11b5ddc787906b7f2fe46e4db1ada6d3f

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