Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0ac4bd88f0ec04c…

MALICIOUS

PDF

82.9 KB Created: 2021-07-26 05:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3989ab7125170bbadbba9d66a235e41f SHA-1: 9f0a72f6c65d43d73d73b17a1f1da702572eae63 SHA-256: d0ac4bd88f0ec04cb83ce904d627f67d3404908e21340023903f9ee24f24bbc3
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV both strongly indicate this PDF is malicious. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users. The presence of multiple PDF link farm heuristics reinforces this, indicating the document's primary purpose is to lead users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://medtek.vn/storage/file/wajetisimanonesode.pdf In PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/t7317m6ds47k2ggiuf79oo76to/fodetoramibudawanasavap.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607af90f89849---bojusomijaxoramesuvad.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/31f9cc72e0d1b8ad238abd49d1b0bd08/zadebul.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/6ff9ae718029333512f5152c27a486ab/13171902672.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/47368429083.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf847bb6247---pabesoseparujegov.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/4c276244db71f409ade72c2301c9fb12/4662064849.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/nowepogikujofod.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2020.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/41448054058.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/xaguripejarogulisolam.pdfIn PDF document text
    • http://nakatka.com/files/file/mugul.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/83408137060.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/49655585942.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc7bf97baa---34772028022.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/worerizasitajibuzizam.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85ea62fa4b---woxewopetakawepafufupa.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/99841882821.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/81032776055.pdfIn PDF document text
    • http://tencanpowder.com/d/files/jizanodogil.pdfIn PDF document text
    • http://01host.ru/userfiles/files/95875330630.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/0015800a3fbd52b8a587f8c76fd4bcbc/32945808722.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/5598ddd838031eb40a2c6423345542c1/65673645784.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a5f2ed14---57146400716.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/wafebifepu.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075e76ea2b89---90446607036.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b284376d79---70068979092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+install+kitchenaid+microwave+hoodPDF 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_off0000e0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EA 10868 bytes
SHA-256: 23579c0b543dd427d67f00d3aff0402da731d3fef52def05ffbf3946b46a2bc7
font_02_sfnt_off000111d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D4 16676 bytes
SHA-256: a7b7679ebd42c63f8b8d10973752b79b379e2d0d4d3636065c83913e2e059a35