Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bae403ae11abf6b…

MALICIOUS

PDF

81.6 KB Created: 2021-08-15 23:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c1aec12d0d62e936a50459e3c3f3d1f5 SHA-1: 25981f5cba7de85345ed56f6ab14d44ca5040ca0 SHA-256: 3bae403ae11abf6b46c6efd67a5f9323e4b793ac86d1b0e5959d6dce0ec7e831
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 0.9987

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://queure.ru/uplcv?utm_term=how+to+do+improper+fraction+into+mixed+fraction PDF link annotation
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a10a6231121---56782581155.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/1lfeiskkild69anbu62kl5dt1t/rujomapujipofade.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7674f550d94f5e26b91290b9b66c5c77/73102057921.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/tasagojekamatubadi.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/72802640339.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e57c9ad2b58---vedefenikokewowibudog.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608071018028f---lemupufoxogowek.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/ce6159cc3591422833bb42f414d9b909/86907445770.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/ditonolofifovaxixi.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d2d16eb34fcc401e9efdff9a0ac56517/vatenidemedinimurol.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/kajesubub.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/99160825310.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b21a54bf93---22725917347.pdfIn PDF document text
    • http://iviltra.lt/images/files/23852833900.pdfIn PDF document text
    • http://cucthongke.vn/userfiles/file///wutekuwelu.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/0c4e26f611e4bef1fef45554a01becfa/jezuladesezomiremuvudi.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/1501277240.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/tutuvedalejejijov.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/b84dc0f68870113e16e35dc924baf893/pofuzijiginojulagelezume.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606c819609063---75633865139.pdfIn PDF document text
    • http://absigorta.com/E/file/mepepamitidajedi.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/loxejiv.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/bcr2ao5qe4m25og77ekprdpmqm/sazixa.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_off0000db77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB77 16624 bytes
SHA-256: 8cbf4df990376ec4f95f1ed650c8b81e47a09a9882f385ed2bfd216378feef59
font_01_sfnt_off0001067d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067D 10744 bytes
SHA-256: 7376cc12ad5f9d34918d2873c32ebacc28213fd9be18d44cf6791cccdd5cc683
font_02_sfnt_off00011f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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