Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d1a99efd1fae4d7…

MALICIOUS

PDF

120.1 KB Created: 2021-07-06 10:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5331b9678eea14d4f9541d590ef726df SHA-1: bb240a613e6a94d975178fff4105ea3931c58f3c SHA-256: 9d1a99efd1fae4d7f9fcd03c4736e9a85f778a5a9c767f36548990acf96458d3
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16083fa3783c2f---25069698564.pdf In PDF document text
    • http://alkanboya.com/files/file///21737210917.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/b80d74cebf0c201badf61ba2f10b5bdf/75040038419.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/58170f8a9108bc5970af494b5a512e11/jewewisufitexozuridosefuk.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f9413ec8d---likikurasumovosu.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/65961725358.pdfIn PDF document text
    • http://vizcsap.hu/files/file/xalenefemazudapizepeje.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/xobekaji.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/33733383868.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jebak.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/0df5278c26d392aefef784c98e56d77c/lojetisurikalupekomajami.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a9b3c7b24---51109843135.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/wisutibinimunonunoj.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afab4e5c26c---98830941730.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21f18d1bbe---zetokupirirojafewa.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/mefezazalaxupemokudinose.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/6beirqskielvcjmo6l6a0jq6a3/garibotuwipikisirajam.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/6077c17618b12be77d73cfb93aaa9f19/wojas.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a99e5ce89e7---kigitisexikuvipovukop.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/zopifed.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/8447153001.pdfIn PDF document text
    • http://envigest.cz/upload/file/96536943057.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c737b8971bd---xupinenefugidizelutel.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/15db48b80845a568a8ddc32a5c2fc83c/92077784796.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/f165de62314fa26b90f340de4cb2e064/vubipofezomumeti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=canadian+forces+technical+orders+manualsPDF 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_off00017359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17359 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B70 10872 bytes
SHA-256: 14f8d9b3f5577b2463ca79b5126d4c648a0a16b29ca4b2a4f72a6aef5fc5f87e
font_02_sfnt_off0001a45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A45E 17676 bytes
SHA-256: 8f2a0911777194edc18a2bc266a3e5e3bc534a2a194bb64fd0c7302f3b752c8f

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