Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3180d48ad71798c…

MALICIOUS

PDF

77.6 KB Created: 2021-09-02 12:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b603389e58aba2fc1681f09540210a9f SHA-1: 925f0ad80bf7aaf512111359e1965b686edcbb1a SHA-256: b3180d48ad71798c1c97cfe59b4b2a2ccf2f5da4ac9ae91a692db5bfc8a6fcb1
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised websites hosting PDF files, suggesting a phishing or malware distribution scheme. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs indicate an attempt to obscure the final destination and potentially leverage SEO for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://insights3.com/wp-content/plugins/super-forms/uploads/php/files/d0e1d977a00940f448efc75cf6d576f8/pasawudogomewaxevidagag.pdf In PDF document text
    • http://rokakisreunion.com/clients/a/a8/a85ca1e4cfc2bb88d767af442173b437/File/1879946743.pdfIn PDF document text
    • http://santeh.md/img/files/281153749.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609758414e81d---kelegufonivewovajosusi.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/gso676os92kutbhc6eb0n0j3e6/jubepi.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a55a2682c97---putuwewowapuxulu.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/faa3de825d48a41eab6f825c7596af77/xepidubewazagirupax.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/mus9v0nl6b6rnhjvs8a4ndpja6/tidesenobexigagunoriba.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/torewuzosupewu.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/xamigazejupamexebuxamaz.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/45639933792.pdfIn PDF document text
    • http://samwha.com/upload/userfiles/file/86990042517.pdfIn PDF document text
    • https://bursac.net/userfiles/file/73233153738.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/90997101796.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/okgrktnif7iukjt9sphg40hde9/dalememekuvuzimijijov.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/6ufcgqshk7eje47678vlkou85f/46058141588.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1610d960089616---widigiriwoguzumumukupili.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/pewajinoko.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081fd9f4f0ee---52374264436.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/pegife.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d3ab147d4---86138093164.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/vemafuzavi.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/67712225904.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78d5c2c30c---weleninojareparupuzigib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=forcing+chess+moves+pdf+free+downloadPDF 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_off0000cb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0D 16772 bytes
SHA-256: e07e8a6d29255578bb00b8f59aa98b7283ce9c4840c375e4850e76d462a8bb4c
font_01_sfnt_off0000f6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEF 11100 bytes
SHA-256: 8910fc5e49b2f65ae833642fa125fcbcb341b891ce1fe598f41df6a9c9bf079b

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