Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1eb6378e581e90f…

MALICIOUS

PDF

92.6 KB Created: 2021-07-02 01:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 42a04c5856d562f6c6e9634db6a1f3c4 SHA-1: 621923225b6f9d090cd43ab229755d0cd566ac89 SHA-256: e1eb6378e581e90f41ae09a0b93297caa34235bbe8b92149bb8ef1e9746e070c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a phishing or redirection scheme. Heuristics suggest it's a link farm designed to lead users to malicious content, as confirmed by ClamAV detection and ML classification. The presence of external URI links and compromised CMS upload links strongly suggests a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://oniceh.ru/uplcv?utm_term=red+spotted+cat PDF link annotation
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/8ba93d3f9bb7f9e7c182ad6a51fa9b8a/sijuripu.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/82134355917.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210618013246_7h7i1i.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/7e9d45fdd47d08518fc56b872efcee0b/natutosapapadewar.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/usqs30hh4t1ifm0q8v9ikb426d/36862572111.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/qo22sp35qpnr61asdj17jf6su6/kavudijezitojukagut.pdfIn PDF document text
    • http://lowndes85.com/clients/d/d3/d39312ffd46aa2fbcc4e4de04d96a17f/File/59393409150.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ad3cac0c4c70b02da142e99df6c35d15/pupawazusarifinokufafe.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/bejak.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/4489774952.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160789ce741081---wizufi.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/81p32qsr6f6n266fgq8vd231lv/kipezi.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/litamo.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ef33aac6f---jepas.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/xosiduwovotujezojivuw.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/86465107122.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af9232b4875---begalifes.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/52993135540.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/7df5e5601ee79fb3625368d7f4c3d47e/80512428355.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/wemefawutepawamez.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/63616282023.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/2f7c57e6cd0cb750195d466f2f8ce128/vupowumebelizakuj.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1ef1ae761---pulawanodemuxubavo.pdfIn PDF document text
    • 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_off00010621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E33 17912 bytes
SHA-256: b22abe7fb4497f556c2115eedbef8eb07268b2809265dd2343ea5585614ca36b
font_02_sfnt_off00014cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CCA 10208 bytes
SHA-256: 0066bf5aa25e29dc24d70e0f7cf4163a6d5e05e0db01a66f20da44bde263c60f

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