Malicious PDF — malware analysis report

Static analysis result for SHA-256 49df8ac4e643be1f…

MALICIOUS

PDF

72.9 KB Created: 2021-06-20 14:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 1a16b0a7a4ed95bee44cfff747a29d4d SHA-1: 11ec203fca9e3aae2c72c128b7dae36631b340c2 SHA-256: 49df8ac4e643be1f77e53feef957d65831923ea1bcb18acfeee533150b1bb828
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites, suggesting an attempt to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs and a link farm heuristic indicates a high likelihood of malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://magogaralbamoble.com/galeria/files/77875017818.pdf In PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/87009378225.pdfIn PDF document text
    • http://siembra.me/uploads/files/nokifalop.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/ripemepi.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/741d9c6219c5fe236dee7d6786930f36/gusilipetixagopa.pdfIn PDF document text
    • https://fallsplat.se/file/fojovosifam.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16072d099669ce---zogewadipiminabevog.pdfIn PDF document text
    • http://scro.ru/pic/file/15046015042.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/kulifotukemudezosetofekog.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/82b9d3f1e2b534ce187025924f75aaf3/xonigovo.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/78767729676.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/23534424645.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/ropovav.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/xakuxekafugibojakutuzuzuv.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c27960ca0d---padew.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/1b1f1f02d1f53ffd141e696d9ad2cd74/jatatiwububimixuxovufo.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/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=4th+grade+english+worksheets+with+answer+key+pdfPDF 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF59 5556 bytes
SHA-256: 836f7e66cce2b99e898dbf66f4404b326dfa71aa2245f66546de140a299280a0
font_01_sfnt_off0000f258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF258 10496 bytes
SHA-256: 0864ba0494136285c61c5585d1c4a6b2b823ab8bff9eed51244d63dfe9803ffe

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