Malicious PDF — malware analysis report

Static analysis result for SHA-256 8782cce80a4e0444…

MALICIOUS

PDF

95.0 KB Created: 2021-07-09 01:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9c5fbc42ccda364cde7144129b242af1 SHA-1: 75af59793e8a1bc130007f4c34a0d3aadd9225ef SHA-256: 8782cce80a4e04442e89f66ff14cd5ff22832e17ae0cc7532bca45796d186732
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories and disposable hosting domains. The primary goal appears to be directing users to external, potentially malicious content, rather than containing a direct payload within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://zhouzhuank.com/v15/Upload/file/2021619828131969.pdf In PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe02b941f0---86039002593.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/rfaak4d46j7kclhghs0rbb21v7/jimizibila.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df49c7c7ec---14590314935.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/tujonokigoguza.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/24qqtodttpn5altbuhrrs4vkmb/rosasuz.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/4c8634a1b253af97e3ab1b6b86faba88/xutatefe.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/jizefasozizuwifufufiwigu.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/7333942393.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/572sfn1tcqb3rdpf9fijab8rqn/40146263190.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/91fa5ac59f8456d799d39c6df9d6f053/51467452803.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/ditex.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/fifanamitebituluriwejunuv.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/d9a7e72b3a8965bf74ab751b8e1d4cad/kofisefewav.pdfIn PDF document text
    • http://fedime.org/imagenes/bunevuloketoxu.pdfIn PDF document text
    • http://capri.lt/userfiles/files/44930980528.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/1232696869.pdfIn PDF document text
    • http://texmet.pl/userimages/file/ziwekorebajum.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/7cab5a530a66dc956217ed8e03237f4f/difogufew.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607559d1c7def---60310221199.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/nilomamokafopikupotov.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd5725f55e---govisunukiluzebo.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e66e39cb5---51723059340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=another+word+for+yearPDF 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_off0001106d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106D 17392 bytes
SHA-256: 2da430fe48311079f94c28e397ff25df399c405ba391f2ab70fb5362856bcc8b
font_01_sfnt_off00013e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001561d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1561D 10328 bytes
SHA-256: 3b801b26a3ec1f50119836ea63ea465c0f768e746a901b2740e0a988548b5515

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