Malicious PDF — malware analysis report

Static analysis result for SHA-256 e621cedcbc7007e5…

MALICIOUS

PDF

92.3 KB Created: 2021-08-07 13:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 660c2ce49fcc4e5afdf54c9d18754c2a SHA-1: 0fb0976db98a2d509bc15eaa3333eae7e2c928f2 SHA-256: e621cedcbc7007e5a65185bc0c80b1b32b7dd995ea703084a75a9c96ddc2162a
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 or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/0e6996f35a77fd252d8b0fdbda1336f3/85775721965.pdf In PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/80232566378.pdfIn PDF document text
    • https://famecosmica.it/file/nimopezidaruti.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/33711785015.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/rajida.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/18767589306.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/dixexoxin.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/73411793112.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/28708370005.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/rigiwagetoguxor.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092e08aec4f9---jepopovegisekuwefonazovit.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa6c6eeed2---29785762796.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/57254784298.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/60bb3c01f28996837ea4a3f17741ceea/tiruvodokiga.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021062618561991.pdfIn PDF document text
    • https://stvorki.ru/files/file/tedufalakovufedafifi.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b889b32c4d---76341502765.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/79877081344.pdfIn PDF document text
    • http://eichler-kammerer.de/87660869234.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/dedadaxigogud.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/mobasib.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cda105a1f---robewulufadikut.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/saritatukujubixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=does+apple+cider+vinegar+affect+ketosisPDF 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_off000103df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DF 16700 bytes
SHA-256: 70efaba87c891c550ee2b79e4ab643417e4e05810d1cada6186d9626e0acd647
font_01_sfnt_off00012efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFB 10952 bytes
SHA-256: a6897184b011050a9aa07904211fe1b53a142d566553527ee09af7eb38e19cce
font_02_sfnt_off00014855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14855 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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