Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8da176b55af017…

MALICIOUS

PDF

85.3 KB Created: 2021-09-18 08:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 743825c324f5f32ca1105c3a51074679 SHA-1: d622304d3aede84e153bf76f752df354b29748e4 SHA-256: 8d8da176b55af0170103e6068ffb5cd1baa11bd13748043c8b3885b46daa8727
204 Risk Score

Malware Insights

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

The sample is a PDF document that contains embedded JavaScript and multiple external links, many of which point to compromised websites or disposable hosting. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update, a common social engineering tactic. The embedded JavaScript and link farm suggest an attempt to download and execute a second-stage payload or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chia4kids.ru/ckfinder/userfiles/files/gexebum.pdf In PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/misetirojiginefudufujapu.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/bipitalamukozituloxukolu.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/97308137661.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/6506341037.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322f700471b---58494041624.pdfIn PDF document text
    • https://nexapos.com/upload/files/rofoxopaxi.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd440ec93f---zenobaxupureku.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/66505453556.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/tijerozata.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/zumolupurawusatinuru.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202108311905372170.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/36253721875.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/eor8rigl0a58qse9vrjoo43lj3/42325578948.pdfIn PDF document text
    • http://df-foundry.net/d/files/37925197583.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/galosabe.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/tolubaxalojaxamimudegu.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/25922469452.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/74494669327.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1630495075/files/tidolabolijoloxanaje.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/75758015339.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/58824094488.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/31491761280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+block+access+to+a+website+chromePDF 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_off0000e980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE980 10700 bytes
SHA-256: afd4b95d90cf1caf26306030c873cabe6ed5c33e2ff58daee1d5536a3701614d
font_01_sfnt_off00010221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10221 17156 bytes
SHA-256: e08f7068e25f4069397325562505f0cc41b036b2405aa3a963c46efc0a5ed6dd
font_02_sfnt_off00012ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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