Malicious PDF — malware analysis report

Static analysis result for SHA-256 2235eb0b62fe3d1e…

MALICIOUS

PDF

77.2 KB Created: 2021-09-13 05:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 401584474d55f9e1dc16033005f095e8 SHA-1: 16b5ae513f6ec270ce76332903119074f73abea6 SHA-256: 2235eb0b62fe3d1e9379be6c96489d27b3cd00f14ca1dcb4277b647cc9d6e8ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323162299b7---dikakopegevepopejoturup.pdf In PDF document text
    • https://pmsp-me.com/userfiles/files/gonagarumemekimegosix.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bba5926643---50891086782.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/nb51eg8a9enihc35j0gebk4o04/80945156347.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/paluwatosapigiboxegopasi.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/27297651320.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/nevanazeropozalixuk.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/30675180021.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/jidar.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/dedutonuxenunumuza.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/78248562811.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/44357831343.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/riduxuwim.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/muzusedativ.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb655d9226---jokinobuzujelox.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/60088623765.pdfIn PDF document text
    • https://electroagro.es/pub/files/42479562321.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e01c22d2f2---10534897280.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/darolijifonoxubeni.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/lesutuvowezik.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/44107064262.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/39f927f187ac3026a6a0e38a7d13cf5c/bekedalolukomamip.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/nitudetaworimogev.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210906_C8BC97E65AA4494B.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=online+mp3+converter+video+to+audioPDF 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_off0000cc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC44 16012 bytes
SHA-256: 3f7d0a57a7b7eb6507aaa16442c769ae8a6ad11d0e72d96cb3eee2e2e876abfd
font_01_sfnt_off0000f5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A4 10872 bytes
SHA-256: 0a207d27f87f097f2b70643a7f9d867de641026da72f26ee11abd109c91c8757
font_02_sfnt_off00010ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1