Malicious PDF — malware analysis report

Static analysis result for SHA-256 3918128cb0e9b667…

MALICIOUS

PDF

104.4 KB Created: 2021-09-04 02:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 26a4be2fc5c456f311525b871bbce845 SHA-1: c26ff05feb027ca7bc03f49e6153c8ad6afce94a SHA-256: 3918128cb0e9b6675662ffad962466d151a04e95ac3a2814026737420c26fdf3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple domains, likely intended to redirect users to malicious content or phishing pages. The heuristic 'SE_INVOICE_LURE' suggests the document's content is designed to trick users into believing it is an invoice or payment request, further supporting a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/33063657136.pdf In PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/bd90c2fdf423d4944c9562d70db6fdf2/letofawuwazobapom.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/a8a87c26fed17cc494584a4b3d2401e7/fapovikazizig.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/bafes.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/kukigavusodidobosurad.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/gobowupisaretumesumix.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/505jmcl3jgskj261qmt4fhfjr6/janebevewegenojaxoxotiwo.pdfIn PDF document text
    • http://envigest.cz/upload/file/81599797073.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114a0df7a1ec---kurek.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609103f5182e9---63891284648.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/58813579180.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/27951991246.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a8127e7d4---suxarisobudomaneniragew.pdfIn PDF document text
    • https://digireg.lu/upload/70517532632.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/winal.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/sowovalefipabawojegiz.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c933d1de0da---tozevora.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd81cd1f94---34943600476.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/283vbb8dd8e48bgqbv6er9phfb/jebovijoritipamumukezo.pdfIn PDF document text
    • https://congchung7.com/upload/file/49382314694.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/37383797089.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160768a2916c2b---mesozaseneg.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/fopijezil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=prioritize+monthly+bills+worksheetPDF 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_off000132d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AEA 18512 bytes
SHA-256: f663d2bcab6bcb5ecc7a0d8e4fb8ec1d6928630e5e244aec2e6b0bae629f9ca0
font_02_sfnt_off00017b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B3A 10704 bytes
SHA-256: f8ed4da5d5519c6c786e6ce143059c9b2cfdad5fc10128b8949e09acf68ad242

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