Malicious PDF — malware analysis report

Static analysis result for SHA-256 6024043c4458e5b0…

MALICIOUS

PDF

86.7 KB Created: 2021-06-28 10:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b555a9a4d60ba4fb12787f91bbf0a5d4 SHA-1: 3853e156f16cf607d6739c5df369d8c893b4eda5 SHA-256: 6024043c4458e5b0b710c9bd2fe3d39429802d96c433438d3bb2051b9bc62648
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm hosted on compromised WordPress sites. Several URLs point to these compromised sites, suggesting an attempt to lure users to malicious content or phishing pages. The document body is unreadable, but the heuristic findings strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbeae16fa63---9159174506.pdf In PDF document text
    • http://wildpflanzen-planung.de/file/48164769205.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/7949691471.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/jifexajovasatewuku.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/607b9bbdec66491d13b0d6421e6aa307/kipazobofoxoxaxejibiva.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160809e2c6ae26---17784551657.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3dfbc2d68---96882185336.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/vowowowofelolas.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa40007e1e0---sivevumuj.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f120188b76---95017130977.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/71037118330.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d30e318e62---tufesetebunixuvowamamuz.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb02618472c---pijoxirapuxularabolexi.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/j9f9br544vkieemhjqm0uihr53/kosunegowigofekigi.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db02b50540---wifepibow.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/vbge1e3gi1p474bmj2utscr62s/67135102213.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///82645551728.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b201656e8c---78923823350.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/148a58e1cc421bde226829ad4014b03d/wejikakiloxukedisilabukuz.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/filuve.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608aafb7e16a4---gopepezami.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/7eb980bf38e5847020192332b4a52c85/jeruvosemixubapujekado.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/33558001297.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/aadce81d32948a676071bb793c3a6701/52365005811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=group+of+wordsPDF 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_off0000f15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15F 10080 bytes
SHA-256: 93e32d47dd5bdc790117942b504c664ae9ded3478e7b888e37406aae4833c464
font_01_sfnt_off000107f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F5 17824 bytes
SHA-256: a990a781a60b0ef89b1e3de2d9f7d0ace22600ca387362855494a8b30137cdc6
font_02_sfnt_off0001360d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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