Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc19c6352f00ea4…

MALICIOUS

PDF

78.9 KB Created: 2021-07-05 08:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a606e6ee9102cdfdc5faaa4361943659 SHA-1: e0f2d8fb5a5ca44b9cfa40a54b038f90828f5ce1 SHA-256: 3dc19c6352f00ea4d6301add6caddd6da87cecc1231a4e5e2c5beb48e1f809b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm hosted on compromised WordPress sites, which redirects to various URLs. These URLs are likely used to distribute malware or conduct phishing attacks. The presence of multiple external URIs and compromised CMS upload links strongly suggests a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=fast+and+furious+hobbs+and+shaw+film+online PDF link annotation
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b8364bd1cd2---22623945398.pdfIn PDF document text
    • http://swingdesignhk.com/userfiles/nebakerud.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/25336897145.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210609/file/16231971389437.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097b958dcae5---31378891344.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c30a49447b9---xafowanamewi.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6604a51dc---sebelaroxatanuw.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea31b406c4---purixodiruselit.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd06433873---bajoputixi.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/tudopi.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/474n2ubsc4sqjtel3slsu5j8ln/lasidemuzumegapupu.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/xixutozezuvigupisufexaf.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a032619143f---gutadalaxapovaladebixo.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/1i8rdp42fs1ios18vrbnag5ur5/debivusexogowikisagozoj.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/ru1iamf2ivg471gag46vpdvka1/gemetakegoxenojevaz.pdfIn PDF document text
    • https://agatanorek.com/files/file/vukekagijeka.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080676656db8---70376171779.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a77235281d---tuganavujamigumojuxini.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c1bbc44fa---90879882432.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/71841659944.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/80460298825.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_off0000c28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA6 10920 bytes
SHA-256: f8a926ed1e923eb787c8abfcf4aaa0a827a866e719666e6e29a698a99c20d834
font_02_sfnt_off0000f3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 26304 bytes
SHA-256: d67b045305e9ac40191b57f2733ff28108fa8d9aaaa5654c80bf43147f3ef276

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