Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed90976b6941a63a…

MALICIOUS

PDF

75.6 KB Created: 2021-09-08 06:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4640722e62aaf1730aa1e79c6ca09eab SHA-1: 5512a2e49081d294c2f25d24ea739c001ddc0b29 SHA-256: ed90976b6941a63aeaf6c439843a40862880510605f1514b43a3cd6dd05c0855
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121b00a6c603---roregi.pdf In PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/777be6cb356c04d109bc6066921b42d8/xanalejidatipeki.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ec8cf00f6---69913311451.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/56152727993.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c8cc105c3---sumeluwukonisifeparu.pdfIn PDF document text
    • https://mimpiindah168.com/contents//files/21832703447.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/4c201760b7c7ca8f3ee2389c47e89bd8/57335411018.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/876210d012b82455b4330a39cde78547/29457509742.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/89974822121.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/zesixefalobikizu.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070332d962e2---93012590318.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/duvepemagurobuw.pdfIn PDF document text
    • http://africareview.in/userfiles/file/solerogosen.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/0mbma9iv8sarfho7kuerqsrrad/gekabewufokirajewotug.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca79b5c39c---55709216627.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946ad7e774f---tixipofuvizuvovibevawidok.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/93143860607.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/11890114037.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160ba37f4e32ac---50392098654.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/89115007761.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/f62216b6fa08d4225124f1f47e3e2414/mozofigareponofefatapak.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210723071028.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7a16b4cd4---loragisepetuloxenagusot.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/17139696888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pdf+text+editor+online+for+freePDF 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_off0000c512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC512 17556 bytes
SHA-256: dd2af469d7fa2d70fa645d16df6b61024ea1463349468408e8cdc6244c425a3a
font_01_sfnt_off0000f1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EA 10120 bytes
SHA-256: 3f2e48dbc5cc1fde111dedabcb61484427059e76e537c0912ca4e0968e174f68
font_02_sfnt_off00010896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10896 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1