Malicious PDF — malware analysis report

Static analysis result for SHA-256 34f765d35291d6b4…

MALICIOUS

PDF

78.9 KB Created: 2021-09-09 14:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 71a6a5e817fc30c2488da5b7cba44035 SHA-1: 19089fad0e713d01c601bff79f3690b921bb3339 SHA-256: 34f765d35291d6b4b14278d1c85e4c7c20b04c53d33b0f94c3ef94d8c89e673b
96 Risk Score

Malware Insights

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

The PDF document was flagged by an ML classifier as malicious and contains numerous embedded URLs. Several heuristics indicate that these URLs form a link farm, with many pointing to compromised CMS upload storage. The primary purpose appears to be directing users to download further malicious PDFs from these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://salondebellezaanamariaromero.es/ckfinder/userfiles/files/bokepewadenavirav.pdf In PDF document text
    • http://pm-ural.com/uploads/files/gexixapodinijulojuj.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/laganifisakubo.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/lorumaladufuzaxin.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/guvedomisulubapopakipinim.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f2910f6cf---devurezumidogi.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/xebanalorejeponosizat.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/18552802808.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/74797544393.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/14094022483.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sifalukaverenixez.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/loketudonorix.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/25839036448.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/81669217773.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/bijabawasasamajikaz.pdfIn PDF document text
    • http://epmachine.ru/d/files/23662901800.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/d3129e03999d425d127d47a2feed706d/taxotukawarojixu.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613283f238b70---27479712030.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/puvevuwarokisipeluzoj.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/16425045108.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/kawunevedefivo.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/19796258016.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/nevuto.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/rexagavunafizumilaxu.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/15026732639.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/60266105099.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021911328108430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=cara+nak+download+play+storePDF 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_off0000d307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD307 16412 bytes
SHA-256: fdc7523293691e4abcf98bbfedd77de19a35ed9011028783970369dded4f258d
font_01_sfnt_off0000fd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11534 10616 bytes
SHA-256: 80cfbad4787ad7135c46b241a5d5b862ed5c6ff368e49e021461b5502f7dbcfc