Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42a982e205f0eb4…

MALICIOUS

PDF

88.4 KB Created: 2021-09-22 13:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ffabef8146b182814a250870b47cbf00 SHA-1: 04a82d6f6a3bc56dc9218b618ac9c24cb74e579d SHA-256: a42a982e205f0eb4a0e111e2d9a963dc66592c96b1c950a47ad8000a85001541
136 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 CMS platforms or disposable domains, indicating a link farm or SEO poisoning attempt. The heuristic PDF_RANDOM_URL_LINK specifically points to a suspicious PDF URL, and ML_NYX_PDF_MALICIOUS confirms the malicious nature. While no scripts were directly extracted, the presence of external links suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/16491291722.pdf In PDF document text
    • http://sinproval.it/userfiles/files/28345574497.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ba02b0f8d---58515234783.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614238c3a96fb---gekaranadiremekogig.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/43680631956.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/lurusizapufotidut.pdfIn PDF document text
    • https://ikima.fr/uploads/file/14597327230.pdfIn PDF document text
    • http://autoescuelatosal.com/galeria/files/ferufamamuturapip.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16145594ce1108---zumibijorefit.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614adf1dd1b01---xezusujikurivafunalu.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/xubadumevafezixumanar.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/gasofevowilaguwoda.pdfIn PDF document text
    • http://smogy.ru/files/files/81480927487.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/kadafosaluneti.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/61795509844.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/27375575032.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/zikotubob.pdfIn PDF document text
    • http://kasand.com/userfiles/simelimena.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/bajololeporovemopipefip.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/wajeborusa.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/62992874177.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366f68bc199---74344121818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=redmi+9c+ram+and+romPDF 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_off0000f466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 19008 bytes
SHA-256: bb0049e52ed82abb4798d2eadca66cb331c7b3c49b813236a5c70a41aa6741b9
font_01_sfnt_off000125cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE3 10432 bytes
SHA-256: e359dd2701f0eceeb0a5943c34406c0c251d8cbb0491230d04fecd7defd7df85

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