Malicious PDF — malware analysis report

Static analysis result for SHA-256 84113e387e2995ac…

MALICIOUS

PDF

89.0 KB Created: 2021-09-09 17:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 90d57c40f7dbfcdc178849f8c61eb78c SHA-1: 907f8d64038bc3b77ef51d8a03299e0fe1ea1809 SHA-256: 84113e387e2995ac3eb04eea820cfb81b0616e5b74ad706aa15e8f32a1e905c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://archism.ru/uplcv?utm_term=list+the+electromagnetic+waves+in+increasing+wavelength PDF link annotation
    • https://eric-parnes.com/ckfinder/userfiles/files/vuvurevitolixunopuwekim.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/41872962913.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/65342718967.pdfIn PDF document text
    • http://cochemical.com/upload/files/14819472305.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/60475576032.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613979aa2edb2---98435735974.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/vasewosu.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/77919321401.pdfIn PDF document text
    • http://enewind.com/pliki/file/66875933221.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/pavenu.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/061548234600.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138979a27bf7---ludateviseleworoj.pdfIn PDF document text
    • http://kunbot.com/upload/files/63287054755.pdfIn PDF document text
    • http://kfgame.snailgame.ru/upload/files/20210901181826.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/39078449940.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/39420302312.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/kuler.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/85195640896.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/32683840762.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/lejugawebiwejederuxabul.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161366663e99e1---somiwuwin.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/12588154760.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/lemegoravilafonone.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_off0000f3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE7 10788 bytes
SHA-256: 6cc2e4f82228663a27e35aa8de016c36232b7ba1bb3fb23cfd7deb44ad8d5456
font_02_sfnt_off000124a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A2 19104 bytes
SHA-256: 3133078845f6a87d6afec810a8e97f80ed2ea5ad0e615fc8e335d8348c4c35ca