Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e24eeab6d5331fb…

MALICIOUS

PDF

96.6 KB Created: 2021-07-18 13:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0397bce778e1a4a7d5de3b179b872f61 SHA-1: 0f23b40745a0265fc946034164b635ea3e817e02 SHA-256: 9e24eeab6d5331fbbf38fcea39966467dcc9e3638e4a85f953970baacde0e959
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on disposable domains, a common tactic for distributing malicious payloads. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a method used to evade static analysis. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076e62054631---3681070480.pdf In PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8ee456179---77533868795.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/xipobotikepuzatofoxo.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/bowon.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/5728d252dfa2726faa65b475b0162c8d/13201741866.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/sejatu.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/87375386612.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7de663e69---6326698999.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/11946504261.pdfIn PDF document text
    • https://12waktu.com/contents//files/54462901044.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/56e57d30cbec3bbed64dcf4c730e7f28/71976447548.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nefegulabajumalulumenu.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160842530b4234---44196208113.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/jawigumumedesemek.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/85853681490.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/62003564424.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/dipabigejo.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/fefunuli.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecd6a5f5ad---68894404980.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/eugerq2k0ppoacru7c5bvm8cqf/35331370039.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/bufajowek.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/2enasaacg4o58g4q84957ofu40/nipuwuropuxurogug.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/aecd3760a75e638e53a99f4bf3ce20cf/21000359524.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/41e8f306ee00924afebce57fa21a1ff1/dusuwozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=french+montana+ft+drake+no+shopping+mp3+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00011998.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11998 22756 bytes
SHA-256: 6f80990c8c27126cc59619f0971921dee1e591bb0674fac34e1babd77a34e40f
font_00_sfnt_off0000e99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99F 18568 bytes
SHA-256: 5f34b1bbc66fd962e3cb627b267fa5b300ec1fbbef64c6bb9cd83b3b7e6a9241
font_02_sfnt_off000141c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C8 11396 bytes
SHA-256: aca5aa877ce5a9a5766134288013302d3a7d86dbb75d300047c1da7bf3d60ace
font_03_sfnt_off00015c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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