Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d6ac5e39d84903…

MALICIOUS

PDF

74.3 KB Created: 2021-09-04 07:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 69a427a928c2b81967850c21ae15ead1 SHA-1: 03f2c6341b2c5de7d00aa82697839ef651ed3cb4 SHA-256: 83d6ac5e39d849039a483b14a42bb11d68cb6b5e1e9af8ae596998b0e2df7bae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. This structure strongly suggests a link farm designed to redirect users to malicious content, likely phishing pages or malware download sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://1-champagne.com/blog_images/blog_/file/wijurorut.pdf In PDF document text
    • https://sofupingame.com/calisma2/files/uploads/34087699293.pdfIn PDF document text
    • https://o-dance.com/upload/files/64108442330.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afcd588377---97548299053.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/28655217018.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/wowivezagoxufuga.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/hf211es5l5pf2slmj76jqj12rf/mogumazupumi.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb61c6e277---96486436811.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/21894493814.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/nebo3oqp7hn0v7mhmlclqt3ea5/6608785927.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/3oj469ikjrnsk3ev0gp505g25u/12958303978.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/mofozivovogidopebidi.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/1010b9eadc334c898a696bc96713dc32/49601123107.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/61168085491.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/c930793415f347ef48eec3ab49bf270a/33831938711.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/0ae9b0ec5f3cdb8c1450249d3781480e/nerewukutemiwov.pdfIn PDF document text
    • https://service-panev.com/userfiles/retuwanifusibizef.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/89937108754.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdead68054---81541742914.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/78313591201.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/jkmd1kqdpn456uv2feg5edmm16/wamur.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/70068341502.pdfIn PDF document text
    • http://lakehighlandsrw.org/clients/863582/File/xigakubalumanetejej.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/miwapixiranemewexilijitur.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/vujideripudutilafamulov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=familia+argasidae+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_off0000bae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE6 10496 bytes
SHA-256: 618400f37a5ad8eac342727688b66b2de051edb5780bae1090b8223981a3060a
font_01_sfnt_off0000d278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD278 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8A 19012 bytes
SHA-256: 0349db50073bef20351bb51585f01c8a434d2a0897f63b623639af01bba512b5