Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3a45c465ff73e7…

MALICIOUS

PDF

89.1 KB Created: 2021-08-16 08:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 89ec046b94814216bcd63e55ceaeb194 SHA-1: f2fd881ded7f4f01ffffac1ae9901561ef962b82 SHA-256: 4e3a45c465ff73e7e8c40e9d3b813ab7761dd48fc863a1179afd8bfa5d2a5556
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic firings point to a malicious PDF designed to leverage external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://bunny888.com/ckfinder/userfiles/files/nubugirimaju.pdf In PDF document text
    • http://birnagarcollege.in/userfiles/file/76885167301.pdfIn PDF document text
    • https://tcremich.lu/files/files/45817269292.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/vegojinugamewara.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/31855568053.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/68178592241.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/16013220013.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/85gqaml8mccfafdbaak5ops6f1/rebubuwixodu.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609f46109bc94---xefizelabopimixotila.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/3731102384.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161098ae07cb13---gusikike.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/72539151355.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/02eb74eea1c363b0f355e760693a0100/97788977286.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15de8559f6---17876818472.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/wewaxexalezi.pdfIn PDF document text
    • https://12tiga.com/contents//files/63440328711.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/65eebe7ed5ea41bf990946a618fceb43/59671001774.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a310bd94bc---89339778334.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f7fddbac0---49833798758.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/43607764856.pdfIn PDF document text
    • http://biafrapol.pl/pliki/file/43327675145.pdfIn PDF document text
    • http://rentaruedas.com/files/others/julujadiparuxe.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/31170150719.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8d088c990---mudovefoxividexuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ejercicios+de+divisiones+de+tres+cifras+resueltas+pdfPDF 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_off0000f3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFE 18560 bytes
SHA-256: e2785e8f20636297d705e268b20392ae5f5df59607f53d97529215b12cad9432
font_02_sfnt_off00013a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7C 10892 bytes
SHA-256: 609a42f79faf8aeea4f54a05faf1a0e6b54ec01229591315b5342281acd7d253

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