Malicious PDF — malware analysis report

Static analysis result for SHA-256 98201c3549fbafc8…

MALICIOUS

PDF

74.5 KB Created: 2021-09-01 22:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d221049825f6123ff727796564cbbe7a SHA-1: 4585fbe4fac303a7139cb26d38f99df5cd341674 SHA-256: 98201c3549fbafc88ae759246474f6c7b442b03af6077301531d76dd6bd81670
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites. The primary function appears to be redirecting users to potentially malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://norservis.cz/files/files/26425109624.pdf In PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3dc20bd984b896ae9724badafed5fac9/fivigebupo.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/ponisuligeliru.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/14526419170.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608edec604383---74936406854.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/fanudojerixevozu.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/midex.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/h7rtgh14tip007aur5aq6h89k2/10127063135.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7a5a752cc4d8fee57a6a35736be7128b/86825985818.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/xazop.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/220a59aafd73bcd37ee5444474fac3e9/74823936874.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720427b7d36---mozesi.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/navozifazoxosekozowukoru.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5de85a2fe---jewovuluf.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd99a0cbc4d---rekokotemi.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/kufuxob.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/wujaxagazadolim.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/36647387085.pdfIn PDF document text
    • http://gyobel.itpublic/file/vipafeposelip.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911ed1f2d8c---lotadeziwefamazibeti.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f15163f641---fibuligafugokigojusiwi.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/44915079315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=stamped+from+the+beginning+pdfPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/99556710165.pdfIn PDF document text
    • 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_off0000beb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CF 10944 bytes
SHA-256: 62f858f65ef0ae471cb594dff238c87b957c5e8ee8e9723b39bc64b819244ca8
font_02_sfnt_off0000ef84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF84 17432 bytes
SHA-256: 1858f18af057df3d088836bbf15b1decc004207c39e5ce8235c52909f6650fa9

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