Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e0df090ed91908…

MALICIOUS

PDF

72.1 KB Created: 2021-09-08 08:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d9adb2cdff214e23497c136838cfdf8f SHA-1: bd33ca75526c85d7e612775aae3cdda8c0e431c0 SHA-256: c1e0df090ed919084ebee7076d4edcb1d76444e73e50327e138be88b741e6bbb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malicious redirection scheme. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification strongly indicated maliciousness. The presence of link farms on compromised CMS uploads indicates an attempt to obscure the true destination and leverage trusted domains for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://francoisdaulte.com/ckfinder/userfiles/files/96778152737.pdf In PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/lulotu.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/37214209653.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/29900862314.pdfIn PDF document text
    • http://www.celso.org/download/35460868051.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/a3aaba0a6d894facf719a043e5ab5948/19934806141.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125820fa064d---soniv.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/210492289.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/15208705662.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/67297609530.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b2472db05f4---jenidolunekugabesowub.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/83358254473.pdfIn PDF document text
    • https://hirurgija.me//files/varukes.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///24793784130.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/9aatd6ihat5g6337d3s2gceh5t/wezakuwaguz.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606da4d53b71c---bafasabarafosodogoxopa.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/82985926148.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ii6mvbqr92gs4rsqoh8qhspke2/kidemodufarufupobi.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608528526c3bd---nanezoduko.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/bamejugaguvukakedige.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/55399516492.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/0isnilp0638um36rtegjj724nr/pukanadilaxebelotojevipip.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/54lnb8020810ljtleuruh6pjo9/wulupu.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/75197235263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=delta+touch+faucet+manual+operationPDF 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_off0000b7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D7 10676 bytes
SHA-256: ec6d15f4003c272cc166330f0babe44cdaa8561e1e7cfeeb0dd45fbd2b9b45b4
font_01_sfnt_off0000d014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD014 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE826 16632 bytes
SHA-256: 266a88ca3cb9ddd35946439271d2d6b51cfb281ec2879a8b00a22fe0e37928cd

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