Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5bbbcb7e22ab4e6…

MALICIOUS

PDF

88.7 KB Created: 2021-09-20 00:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2c90d861bc26ac125c3df5938f16201b SHA-1: 862dc73e9e1df9c15c7b375743f45b15a8a09894 SHA-256: f5bbbcb7e22ab4e63932d4db98e2eea0b713e13ffdf00f1c5b78efe02d22a322
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://coretry.ru/uplcv?utm_term=constitution+of+the+united+states+pdf PDF link annotation
    • http://alltimescare.com/attachment/files/ronopiguseviramitipun.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea46ebe514---29334829863.pdfIn PDF document text
    • https://lasanisports.com/files/lavigalak.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/50082671105.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/24573561544.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/93865223510.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210905023731.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/21026310913.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/91442309183.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16147a630b1c2f---fuwibujuvovu.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/52102055590.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2c9a5c4da833993e0449598261f19ef1/runibujomo.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/76152853772.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350288bb879---mewaneduwekaruxere.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/vikovedujesorowuloj.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/joxibumemode.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/283660574.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/6143954684.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/nemaduberakepe.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/genabidokofotowumugilo.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/77446538681.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_off0000f748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF748 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5F 10580 bytes
SHA-256: 7d40a523a438636bc611d294d39725c5f333466bb1c36a8fd0bbbfbdd07af838
font_02_sfnt_off00012780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12780 17768 bytes
SHA-256: bf738769a357e675c26bcc6b5cdb7479b7a1595e074949097c153be8a36bd84d