Malicious PDF — malware analysis report

Static analysis result for SHA-256 7495dfa473b243fd…

MALICIOUS

PDF

73.7 KB Created: 2021-09-28 10:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d03ab4f03213754cd98cade0143adc8e SHA-1: cbc6b027f6266cb6e96a7cef29e7a29efead9190 SHA-256: 7495dfa473b243fd74e2949631b33df96ca76f01a5e4e8168bffffcf11b22883
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://baongochoa.com/upload/file/zugamepisulivufudipapar.pdf In PDF document text
    • https://topconta.ro/userfiles/file/55119025374.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/madefuzujesijajalujo.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea4518029---38587379488.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/vabit.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161529ad5d5e2d---sikatuli.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/fokejurarixibajanexil.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5b675a5de---54131320270.pdfIn PDF document text
    • http://tiquital.com/documentos/file/1192899758.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/83534020645.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/45306715362.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/658058093.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/riwitetelipogumimufo.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/84218047394.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fbea9455e3---61720321047.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/xegukutekovuwejevamepupow.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/70384081171.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/e0ihsuftoli9f4e2h2lf9l8rhp/zaloposugo.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e0424bff4f---mugiposutefetaju.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/fobod.pdfIn PDF document text
    • http://kaitianjinghua.cn/admin/userfiles/file/202109232223417124.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/89824828813.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/hjf74d1c4rgk7rmkmb9bh3bo4m/givopikuvemibexavilov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=code+shinobi+life+2+robloxPDF 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_off0000b772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF84 19348 bytes
SHA-256: 382b6ae3eb40b78f0d5f9cfa4fa175393b07fcc5f5e52fb191a69f0c90f10c6d
font_02_sfnt_off00010137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10137 10584 bytes
SHA-256: e74249a7732f3763b49bcf167b75f704f77a7fca5b3135fd2e7490acd76475f8

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