Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61752de8d6bc7ee…

MALICIOUS

PDF

84.0 KB Created: 2021-08-09 05:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 74c0582bd50ff0b18b8ab178821733b8 SHA-1: 28db6acc6e386bac0ac461ba572a0080d332d46a SHA-256: b61752de8d6bc7ee79740af01272c6424c67b06b8bd58520e03d0af9e5d0133e
236 Risk Score

Malware Insights

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

The PDF document contains multiple heuristics indicating it is part of a link farm designed to host malicious files, with several URLs pointing to compromised WordPress sites and other disposable hosting. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing a fake browser update or extension, a common tactic for credential theft or malware delivery. While no scripts were explicitly extracted, the nature of the URLs and the lure indicate a high likelihood of further malicious activity, such as downloading and executing a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://samurairamenbar.com/uploads/files/lomavopekexukuxon.pdf In PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8885cc68a---61825284734.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66b753df15---jedota.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/tefinodum.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/xefabuvir.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/lurofenesom.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/59f89e0b7537dfacbe5663b49b9beb5f/xoxane.pdfIn PDF document text
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/42572453099.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/5f1894178b8ae0fa9b38ef8289ec6d4c/88571787162.pdfIn PDF document text
    • http://arlington65.org/clients/880802/File/jikizabusodetosape.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/30229619086.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/wavibivomisilukomubirex.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae7d7bfc53---66115255730.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/13833680092.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6d26ded742b0394f31715199f031f061/62142195565.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f128067d3d---jikovu.pdfIn PDF document text
    • http://short-story.ru/upload/file/55469318297.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/wasugatopunigizetofizi.pdfIn PDF document text
    • http://pritchardreunion.com/clients/81409/File/tomijexep.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/78d5ec370ed0fead6f3248d49fa6d4f4/256838929.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/89302398767.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/f0f7a3cbk2smlaafcn9psnqbfn/jebem.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/tifuditigetamakixeponixes.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/duxiraruj.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/fco0mejad35ebv65aq3rvupiq4/4495325021.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/scph1m3jta2bc3u8rgi446lvt4/46119116862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=advanced+pharmacology+study+guide+for+nurse+practitionersPDF 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_off0000e02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02A 11328 bytes
SHA-256: 6181b57522350cb7aa465bfb6509e79a5a2589c0e41d69b63b3ae71d9aa722ab
font_01_sfnt_off0000fa77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11289 18112 bytes
SHA-256: a239bc403429fd0fb51aa94cd204a478b06b4991801a6406623f9f842965fcfe

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