Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa9a21aa1504daa…

MALICIOUS

PDF

93.5 KB Created: 2021-07-30 13:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: f3b43cd13e5b8cbb3ea29f61401b891d SHA-1: 5901a82014e314504f59d33cd38a891889be75ae SHA-256: 2aa9a21aa1504daaea9ea13cc4bd8f7352b26df2b5c38ec9480aae8ae76d80a3
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many of which are compromised or host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the nature of the document as a deceptive link collection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://songhong-thudo.com/img/files/lorojakegegetelimumugerez.pdf In PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/c37f8aa32d93f173d41acf91ed451669/zetesuzivok.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66dfb4c75b---69365866140.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/nuzepinerizazonatuwe.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/77360140619.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210730_A7C94487516B4FF3.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/nazolewapaxojovefa.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/zaxumi.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/99044089964.pdfIn PDF document text
    • http://guinyardfamilyreunion.com/clients/62985/File/nazom.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/8150841500.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18ec0a09df---80155758940.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/1ceb1bb5d32a7505b82f4a5dd215b290/40439033065.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/penegukokifolode.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/bavetodawugozumurirep.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/f57cbc7e408c2ad6ab06b54ebc4d7ac5/34480440116.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/99532374782.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608aca4383efb---93872837516.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1609280cf90e88---ritutim.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/41661970314.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094345d0ad10---wunifuvowuxusotipetijef.pdfIn PDF document text
    • http://chikatere.com/Upload/files/lojokazexixofuvid.pdfIn PDF document text
    • https://banghenails.com/upload/file/98886887746.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/rifisofizebekumadekipolik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=girl+from+ipanema+piano+sheet+pdfPDF 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_off00010454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C66 19256 bytes
SHA-256: 23ecc9ad057fbb2e84cc5f8ab303f205dc608545fc65e83fb8a0ec719bb241be
font_02_sfnt_off00014e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E10 10800 bytes
SHA-256: 1a5f8aa1816f984841e7ff5b905a5a8c8033784ac9a75f56ab48d6366abada28

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