Malicious PDF — malware analysis report

Static analysis result for SHA-256 12252d59e2c65bdb…

MALICIOUS

PDF

81.7 KB Created: 2021-09-01 08:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 935a1fb1a7f37ccc45d7ed58aee187be SHA-1: 348ee01ae1cf9af3a244a2a1652c734ffd7e045f SHA-256: 12252d59e2c65bdb2bcc3d4a0575615f3fc2f9d96a1d9469671bcf888fd6775d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to obscure the final destination. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to distribute malicious links.

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://elnativocoffee.com/silver/upload/files/lovebageguwopevatubajem.pdf In PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/412279d3092be7f69c8c35117fd90aff/77392153071.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a84a060d16e---47878638084.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-8-18/20210818044905502031.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/15095202829.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/20863704271.pdfIn PDF document text
    • https://kawanmto.net/contents//files/246407285.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/dukolonalej.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/83705775973.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/29925588932.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/c8838d57401685fa9d93d9e5b65f7d2d/zagutunojepameture.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a363f87a018---zesipowenujabexabuni.pdfIn PDF document text
    • http://lighthouseofworship.com/clients/44803/File/51335696015.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160727fb2426a4---75122805729.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/gtm9cdjpqctp32btkrlt731dc0/35059933228.pdfIn PDF document text
    • http://myredm.ru/uploads/file/55466303882.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/vudofogulumoki.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/180406a328af70a70882b5d7e05123d9/70887728625.pdfIn PDF document text
    • https://nicosiacaffe.it/file/nimowufamikebibirizoxod.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b008866ec97---kelorigapowarorifofikik.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a992541d1ed---33989033854.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1611beaa6b42ef---visatuwajosurugerek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=aortic+valve+infectionPDF 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_off0000da02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA02 10208 bytes
SHA-256: 5105237766feb1733004fb556fd6acf39ea2e7c3015ddb563d1d9f12f315c783
font_01_sfnt_off0000f10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10D 18248 bytes
SHA-256: 182dd18649e9d2c1ba7dea6a3427f86216eaf5a8a85728e108be91de74cb8541
font_02_sfnt_off000120d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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