Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f528ef4bd191e55…

MALICIOUS

PDF

224.1 KB Created: 2021-06-27 16:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: e7258c078270beb1750e8514b996db0d SHA-1: 2701d8a6d29b32a9db595dbd067f590c31389d50 SHA-256: 6f528ef4bd191e55fb51c49356080aa3e8eaaf7b8902e73febecadfcf186a0a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

Heuristics 5

  • 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.
  • 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://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/1f343468c155613184718d4f6336346f/61555104412.pdf In PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ijrucllmoegk4iams8t93nakc4/91734084596.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/b4dc99f85b3641e392d6e2d41164f23f/jegubogokebokapajuv.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/53554572564.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/26974673120.pdfIn PDF document text
    • https://kede.org/userfiles/file/belagelokadazagusuxexiwus.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/08otb0pdv6elrch4i56lrqesbc/98943887426.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/69714500718.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/zebipekona.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/12529263052.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/82073420115.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607597e860f20---30043708855.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72b433ef57---fovuravifuboduzeluv.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16096744b60ca5---vuganitikemujirijam.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608344c22a627---sitagizatotid.pdfIn PDF document text
    • http://mestav.sk/uploaded_images/file/juvejefujaviwitapededofe.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/26624022774.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/15147762948.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/262c1ea45aade842cf678b208a98d70b/damupete.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/bubuxuveziramefamogufunur.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/07551029f70ff9af0a4f343412cca9b1/xofuxofituv.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7efe755289---dafigokumabili.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/52fe5052c409c474be72b1cd8516d4f3/retajikifinele.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/matadifexawedekupasima.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/95766776563.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/9f0264d52168afd76f31cfa4be5e6d96/74042791629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=wasted+time+proverbPDF 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_off00030d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30D7A 20948 bytes
SHA-256: 0c689d8d4b8bb0be0841eb7e278d631eb83eddb9d2c79cd264cf3d35aa9b6720
font_01_sfnt_off00034220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34220 10600 bytes
SHA-256: 21f3ef63a2d8c619e95d9fcc075e9054a196025b8156864184b161f6a4ad73c2
font_02_sfnt_off00035a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35A28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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