Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a58eb79776d8a9f…

MALICIOUS

PDF

93.0 KB Created: 2021-06-15 19:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9d79c79881c50f672f33dba0e9f05a0f SHA-1: 6bcf119f7ec0e96947bc26792c470824445707b9 SHA-256: 6a58eb79776d8a9f9fc528651db35ac4ca42cd4bdf1383d171cb329a9378e823
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pistant.ru/uplcv?utm_term=free+personal+budget+template PDF link annotation
    • http://ascensionchina.com/userfiles/file/motewisumavuwub.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/1080866354.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/a47c1085f293d0296cf27437c2c81639/benekefuderokusemu.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/e8633c13f6abcff8d1847e2ca0d40857/pewozibaluposarovuxesebe.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/47qkeq2mtijnne71ifgbgbe62h/sabuxugazep.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/38vaojad3nattpa3aakn0qon87/11717679986.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/ski9779b4ppcdbhrpkqodvs0cp/sekudulenumemupuvuguzori.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33b162c1e2---dejaludutirojorib.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/fecd29ebe6b95b0bbaff71a7b5361881/26120979457.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/26282980409.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d71d6998b5---bexaponitixepira.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16088f5d7f136e---87566971166.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ff313bf74---11880314513.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160beff518a2d3---momiliruzesidawawavoti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C5 5372 bytes
SHA-256: 5279a5c0f1b75cb78dfb177265e2387f9272931bce2a4671234dc8f7e6111a23
font_01_sfnt_off000136e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E7 1884 bytes
SHA-256: 7f6fd28d882d404195ce7a718133bb3075ecafd23c4cf522997036800c192680
font_02_sfnt_off00013fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEA 10964 bytes
SHA-256: 8a4e41eebf3164c96f31ac9c0bb378e27a7219825b7fb46f2ab273fc81ab685a