Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0744c9751abf702…

MALICIOUS

PDF

103.5 KB Created: 2021-09-08 06:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 84ec08cce2e10ceeb827e1e22ba803b8 SHA-1: ad34acc169273f19c37bb44681795b75b13b1b2a SHA-256: d0744c9751abf70207df323ea2cc312e69e3d3be134cd7f40b8a939a8660ea0c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://stellarp.com/userfiles/files/63775947184.pdf In PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944eb75e9df---vajegudorivoxiruw.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/wiponerutawar.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/77719542909.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210827013012453.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/25719479254.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c305c19dde---17398946745.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fff91e0b9ae---jerisikinesikov.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/99895117.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6edfce293---bexotudejavunuxipedoduxom.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/91417721437.pdfIn PDF document text
    • http://idroter.org/userfiles/files/70318971364.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/28085020633.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a76195199---rofizaselat.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/moparugojozugipigozirid.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/40265847926.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/torogekukowazowularopep.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/v1psiri8bictjc09gk0r4no822/nimazexaxaka.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086546eb10d1---funig.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/87119831850.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5b44616da---leludeti.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a06922d47---8404916092.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/52821404417.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/28051369618.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f202070a4---farotezofuduzerebasaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=basic+english+parts+of+speech+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://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_off00012422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12422 21904 bytes
SHA-256: 4a4215c7b526d3ba81bc1ecebcd8b37d6114bc36d218e8a5f46fa0195987b92d
font_01_sfnt_off00015d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17542 10952 bytes
SHA-256: 40603f5d4538a169a6d256f36d533ed3b458c8d2d634a2cfd55680f61f61099b

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