Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15d032da0d3fce0…

MALICIOUS

PDF

91.6 KB Created: 2021-09-05 03:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b36be4fe3d6b82c988275ff79cf9615a SHA-1: f7a3af3e40e50ee098991c6e2c44822be64cfe7a SHA-256: a15d032da0d3fce09db0fdfac5fdfb04d1f07b42b98fdf409e07e6003858add7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm, with a high ML score and ClamAV detection confirming malicious intent. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/15991369c9310a3958afc4a55cbf7108/voxomigobanetan.pdf In PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/jakofewu.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c918b8c35c---venifunozuxoner.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/mobamerosirikiwenigaj.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0408ab641---fadavisamuvozuliraboz.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba03abd08f0---16527237998.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/piraputekolekatadutaku.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19524623960.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/0shvj8jfq2u37944at30jaot57/xakivadovuxubemoburalugu.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608e23a578145---gubupudelugapafavig.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096921f1d307---tefufetobuve.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/87338526043.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/19067654060.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/lapanaxepexud.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/65034545307.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b18387185c---24487820925.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/fonusul.pdfIn PDF document text
    • http://netpost.vn/upload/userfiles/files/53553366359.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efa6406ad9---39892633820.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/aa09c776ec14d48fe12f74a3471d352e/20368228970.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/1813512331927e4f715eff10c5c7a0ab/guzejule.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b411d7bfcb1---tiroleluxomiwezogobukivib.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/63320484558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=almeida+garrett+frei+luis+de+sousa+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBB 10816 bytes
SHA-256: 2fe94cc207ef1857590a0bbb05c2a1cc969a0b171de166c2965544d620c958fc
font_01_sfnt_off0000f47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47E 16412 bytes
SHA-256: 8ff1f4616950659833f58640c7c166bbd27ae52f0f48eb898aa6667fe14237f0
font_02_sfnt_off00010b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12356 24628 bytes
SHA-256: 091e4b185fcad76f1420860a188fa3072757b71ef35169152a0113ab8cb864b5

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