Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b7ae5ec1fe8a97…

MALICIOUS

PDF

78.7 KB Created: 2021-09-15 09:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 18dcbf90cb8068d534c92254826dfcfa SHA-1: db83ed9b9740fcd6be64bccfaa1f8d1e8f025b39 SHA-256: c8b7ae5ec1fe8a974ec1a2822ed23ee5b423e116ff2ec922a700a401ec4d3332
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, designed to trick users into downloading further malicious content. The ML classifier strongly indicated maliciousness, and the presence of a link farm on disposable hosting further supports a malicious intent to distribute malware. No scripts were extracted, but the PDF structure itself is used to host and distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://gramercy-grand.ru/files/file/3062583728.pdf In PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340f9d7b2fb---rukujoxina.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/jedorekapilenul.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/72542069282.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/87658574688.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/bunegujikefepa.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/kakotasesoj.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/78028679279.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/91491954024.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16131925f23ec3---33361917034.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/68046064555.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kiwoxebisoledirobaropetaf.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613E37CD19103.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/91428293935.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614082119f929---febonasajobomozunamufisa.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b267f7a73ebe5e0396c547e1e133ea1c/dumutidunovisepisonemawaf.pdfIn PDF document text
    • http://slovoveri.org/userfiles/70927957837.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/xoperuxixasutisu.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/fagadarifesitorukatudur.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16136a359a647d---28816140814.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16141170b4d121---jutajigezitug.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307c998ccac---simotukub.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16135c1225718f---63490697530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=8+pool+hackPDF 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_off0000d202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD202 17420 bytes
SHA-256: e706b107fda4a29ce0aacb1b611a6c9a7d3f1ff2728b8cc867e7433dd64d56c2
font_01_sfnt_off0000fef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF5 9980 bytes
SHA-256: 09327307203b1e06bc71e228a0a06c107a5a77976d170c8dd4725a23b30c93f2
font_02_sfnt_off00011530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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