Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6baf0673492a56…

MALICIOUS

PDF

101.7 KB Created: 2021-06-08 15:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6aff30784a300ac7a9a431e4723b96dc SHA-1: 08fd671bd5dc945e86f69cee2623a24384595016 SHA-256: cf6baf0673492a56237741bdbb6756093cd0762e973ffa28f826ae33de53229e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites and disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://catamma.ru/uplcv?utm_term=motu+patlu+ki+jodi+full+video+%253B+500+%253B++%253B++%253B+Low+%253B+0 PDF link annotation
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc04ea67b5---fasojifumi.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/3f8d39c93d6636ce20eae387599a8bed/78839720082.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/22059884389.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3ec4c34fe---30993750380.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160980e4c11bfa---62806955120.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcdba90c80---68692738467.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce37d04dd0---58397555689.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/34680138834.pdfIn PDF document text
    • https://sealskinz.ru/files/file/52599843947.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b553d4d7d2c---warujoxex.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/27397710078.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/rikixixiso.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/27434ad165aee4491ec12109b02f354b/92097970594.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/845637b2fbdd37e798f39919016fd6b7/buwizunulaju.pdfIn PDF document text
    • http://asustainable.com/global/file/pulijit.pdfIn PDF document text
    • http://ubest.ru/images/file/gibejetixinudutalurepami.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12720 5428 bytes
SHA-256: 1a13c69590b4e0a2951aa6537cc3a2725e0c1eefa64bdc0e82cc9d5a557d0b2d
font_01_sfnt_off000139e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E9 11696 bytes
SHA-256: 9e7459d7f709f2623b64768df460cb2c6f9f1c3fd9ce70e7acf08e78a94d8dc3
font_02_sfnt_off000161bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161BC 16564 bytes
SHA-256: f4ab57543a9ca8b96bda7cc93201a1b84af3f9db22b1534e91f692240962a202
font_03_sfnt_off00017865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17865 4420 bytes
SHA-256: a7d9794c467646fa7366c1c87219d74d98e2343630a98bef551c60be1b8ed590

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