Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b293ac2eebc68b…

MALICIOUS

PDF

76.1 KB Created: 2021-09-02 16:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 668b2349b6c3836c7e81a2ebac277768 SHA-1: 292f3e91007a5128c88bccfdd07102e99a59c547 SHA-256: f5b293ac2eebc68b93aceb825baeb8935f9a85090feeafad125d0dc4769fb8a0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised websites, likely intended to trick users into downloading malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan payload. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab87007b8f---56760482923.pdf In PDF document text
    • http://huefpdf.org/upload/file/vebawaguvegirasopisijof.pdfIn PDF document text
    • http://rld-carbon.ru/file/zozupiguwejiwoguxow.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/44555209323.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/fukekovuzakepopak.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/27401886560ed88c1c25d7.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/86756672304.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/b75fa9839dd738da1f60c7a4f7a17c47/71568356223.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/15774666104.pdfIn PDF document text
    • http://i-dron.cz/data/file/92872342998.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb272e51612---21835562535.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/13666a6bb6e79c8d0c9be2a872d703c9/gutowawi.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/gibezaku.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/4581091016.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d590e7ad08---47409321345.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/sivonuna.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/pazesorilozopegizetug.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a280ea371ec---xaluveruwu.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609281a295999---pivuwekeveburabali.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/43244324600.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/wubuvilefuteduxaxes.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160710e8f22476---mujofumowisuneneluxu.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d48bd1f4c4---wewuniv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=xlsx+to+pdf+converter+apkPDF 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_off0000c742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC742 16492 bytes
SHA-256: 8f95ca6df32966ce447c6644768bca3b321ce39fb14ea9e0e092a07694b8e04d
font_01_sfnt_off0000f1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A7 10788 bytes
SHA-256: de768f20cd3ee7ab5ff1df06f8ab9e4a1b2989dc1406069af56e08380e1d109f
font_02_sfnt_off00010ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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