Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2254e10ca098897…

MALICIOUS

PDF

73.4 KB Created: 2021-09-03 04:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 558b9907837f10b32aa45b0e74e4beb3 SHA-1: 7811d081659716dd12801602fce28ad85468284c SHA-256: f2254e10ca0988972f44b7a31710db42946737da45866c7a2d6002f5f6a4a714
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to host or link to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e07fcde3d5---60368085689.pdf In PDF document text
    • https://hkbca.org/UploadFiles/file/20210716220805162.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ba35d725e---komigekujunezepebeguv.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/wilofetazitabevi.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/zonisolutegan.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/jexevesatakufinuruke.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/36426712241.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/95320339440.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/xogozonuxogevora.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/j53qhg22r26vh8jjv6q9fk0obe/48514368264.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607db49d0f8c5---zizagezodu.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/34510225484.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dd842d372fbfc8077e31ac1644573efa/nikiwipur.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab56fe72c37---mevopowerogorar.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/66317515084.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1623980992.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/voxisu.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/001ea7441034e21c48c4076314190ab9/72046239991.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/pagujisirusedesevideni.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/qa176p8q3ar48gh1sv8lbadlre/31234189935.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa0cfc305d---4065143242.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/84757099515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=toastmaster+bread+machine+tbr15+instruction+manualPDF 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_off0000bd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD91 11024 bytes
SHA-256: c15e77589687ded05727d3b5ac5036fc959651f65fd1f54c396fa0fa7c873393
font_01_sfnt_off0000d712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD712 15912 bytes
SHA-256: 8ab063743a8eab91432f59dda6b49ab8925f6528c373e0b3751a6054db7a5936
font_02_sfnt_off0000ffad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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