Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd98aa049c20998…

MALICIOUS

PDF

183.9 KB Created: 2021-06-21 04:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c9ededf5ebc0e517e3c0d633034bb713 SHA-1: a4d118f1d46806af3c9e2751d27bb5dcf5510f8b SHA-256: bfd98aa049c2099899d05620f7428ef70fccd1f17273b1d74e2be61e8ca4dd6b
96 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute further malicious content. The ML classifier strongly indicates maliciousness, and the presence of multiple links to potentially compromised upload directories reinforces this assessment. The document body, though heavily obfuscated, appears to be a lure related to downloading chess opening PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4f908c372---majuku.pdf In PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a36b0e08b6---bulevubabugijim.pdfIn PDF document text
    • http://kururlaub-ungarn.de/bilder/files/97114933765.pdfIn PDF document text
    • http://etre-belle.su/images/file/69788648071.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2b647d638---39441403620.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/jvpom40u0p8cc8hddfunki9303/15686465182.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/8872234432.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16080d5960fd50---90182875061.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/bb4vracvbedmank2h5vmgmt3m4/61617034629.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b985597e45c---xopipo.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/tupepubetopezuj.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/m6l4v125fojcl7686r4c402qv8/8802275246.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=aperturas+de+ajedrez+pdf+descargarPDF 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://scripts.sil.org/OFLIn 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_off000280fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x280FA 5408 bytes
SHA-256: 71606f1edd0848d1e5a2f71b3f3624c6cf6ca9a76fd665b63ab1e80df0ad484c
font_01_sfnt_off0002937b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2937B 12420 bytes
SHA-256: a845a74f2152a1a8b197ed4690ba499aef50d1a99f4b436e29663a489ec848d1
font_02_sfnt_off0002bac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BAC4 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

Open this report in the interactive analyzer, or submit your own file for analysis.