Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13a8702f2d89ca9…

MALICIOUS

PDF

94.5 KB Created: 2021-07-03 03:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b3854dab3b8ed84677c97611f7d23a99 SHA-1: 10da01fb92f14b14f272b071cbcf2bab5bfa0db8 SHA-256: c13a8702f2d89ca94a3c93d0ef07ed38ce9e8601f82225255df3f3cd467b4339
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for distributing malicious payloads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a method to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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
  • 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://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/69f23f461bcd91a1cd93e019430ebe5e/73377760780.pdf In PDF document text
    • http://eaas-journal.org/survey/userfiles/files/xuzuvajozaxumaz.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887aedf148d---18869564939.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/76926323504.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/d9d3d2cc52ee094218a3471725c519ec/karirimanurod.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb2b1d4bea---xunatenelipefeval.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/vibezemagewuf.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/wofebisujofebab.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f2fece544---birijotavurepameliriwuk.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/07540e59de20b687563b9fede1408684/78004545805.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/zarev.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/3e0bbmth3lmlpb4a08s05tnsuc/jitobaxizuxire.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/11347290015.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b30a1148e---xusevam.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/3a8de8e6d4b20fea6efb9b103b62b518/jidizuxapur.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7b2ea8054---bedibudunezexaxenaru.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf8ef8061a---fomasafuxaxigaxoxobuvuji.pdfIn PDF document text
    • https://kuepancong.com/contents//files/safadimamekanin.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/19f26704ec65b74df1706c109f10ab3a/49819572426.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/ca655d056de2a7ecf2ac58c4d896d852/tebizajimuxusemejesufuk.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/e6ec209b862c6c31006d3f8355337668/romodik.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/l9e93st9s0rhmt8s0vth7db9tr/89440484189.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210623211530.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a94feee804---gibesedajanojinagabaz.pdfIn PDF document text
    • https://www.truemark.dev/DevelopersIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=java+interview+questions+and+answers+for+5+years+experiencePDF 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_off00010847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10847 18532 bytes
SHA-256: 9f0e2e92ab5d5e7ad6ab7d388c65ac013d27e631b22bf905e381b31410c0855b
font_01_sfnt_off0001397a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397A 11308 bytes
SHA-256: 725637cd3ad2beee96a2cec3ac54cae54d8ade931ed7917f5058dddd4b95489a
font_02_sfnt_off0001542e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1542E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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