Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6e1e1d142c7efd…

MALICIOUS

PDF

81.7 KB Created: 2021-09-10 06:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 72eb52d904f80a67cd8a220ac9cab857 SHA-1: 223d77ec47e2fb6dfb08e7ff6d58171c462efe65 SHA-256: bc6e1e1d142c7efd6bb8535d7a321b601a6a3f176bcb613b606b18a5ac1bb6a3
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URL farm suggests it is intended to lure users to malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://duda-tech.pl/dudatech/upload/file/sotezuxoge.pdf In PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/60134435751.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/pivemaxazeninudos.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/ralalaxe.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/8044590420.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/nupipusipebuvomavulur.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/gixajidifaxexixula.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/16624588266.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300c141b5bd---gitijabu.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/s6tmpvf7idncd4e6ii4e11q3c9/57930478625.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/zafamarifiwovek.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/ludulufixizuraxamaja.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/kavaxosudekoronepusawiz.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/80233176239.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/17818809089.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/garujo.pdfIn PDF document text
    • http://recrute.fr/files/files/nukilofuwafozidaje.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/kalokobuseb.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/maxixoluboxi.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/wedudena.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138357635578---19500912377.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/pokebomonujofadidip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=hard+times+themes+pdfPDF 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_off0000dcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50C 17528 bytes
SHA-256: 42a4933cc307475f7e98205a1af08f2b594e70c3f107bcafc1c748ac1d732e5f
font_02_sfnt_off00012221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12221 10484 bytes
SHA-256: 0b9f794cfc3fb579e8faae3663fb3b4e4956a1e92505cdf4c135560ada73263c