Malicious PDF — malware analysis report

Static analysis result for SHA-256 464a681aa18f6555…

MALICIOUS

PDF

80.4 KB Created: 2021-08-05 03:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: a8d669262f091613b66a4dc0354e7b36 SHA-1: cffae464c5c4f142f69d6622fb587fac28ef91da SHA-256: 464a681aa18f655571679ca6cad0cc64a0ad2eb833b4b7e498ab52924e3c1db4
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-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 http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb66f08b0c---pewufelizotoxud.pdf In PDF document text
    • http://urjabatteries.in/userfiles/file/32130874085.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/niruwoviletudewabun.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/dc3d32b635e7cd55a1a629dfc7a99efd/8629093502.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/bilularitesatitezu.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/63157232339.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/11193845013.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16089d8fff19f0---45036220396.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/muguwikapim.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/latavuninerijukovogog.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/31313872293.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f89fb420732---suvuzegitoxofini.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/pifaluvepesemipuzefeb.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/jelixifufujaragasudo.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/98259987588.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/77029690598.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074bb3b29abd---magakunoxuxeku.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/bilabus.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/a3b50623c25f52034d75fc3adcb88738/tojolaxerawunajofo.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/96fe874227da313d99b0b813aa14a330/narumijunu.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/5f4b7b5412471ebd2e2dc7c05f6474ed/6578808150.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/65202755701.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa0336f800---10983606176.pdfIn PDF document text
    • http://www.miwon.com.vn/app/webroot/uploads/files/39426019038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=automotive+service+business+plan+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_off0000d851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD851 11068 bytes
SHA-256: 1a7fb69331d2ea51ea8b03c9136465934b84508b3fde11f687243dd0ec399ecc
font_01_sfnt_off0000f1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E8 16132 bytes
SHA-256: ef2d728425468e32a869ee834529cfa89c226947f52af1c6f71af5c697cf0ed9
font_02_sfnt_off00011b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1