Malicious PDF — malware analysis report

Static analysis result for SHA-256 b17df05a0eb8e5d1…

MALICIOUS

PDF

79.3 KB Created: 2021-08-19 21:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1a845959424c78452df6bb616df282b8 SHA-1: ec81842564233f8d0f9ca9d6306fa1c5e4a9f5cf SHA-256: b17df05a0eb8e5d1f4daddbd41bc071d7e5a46fcf522c48d36f11aa42371fd28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://keralatemples.info/ckfinder/userfiles/files/legerixigefegiv.pdf In PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cded59ab068---43305430424.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090e5b7a4c29---45031659389.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b5edb129b19---9164977258.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/81421737646.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/rafolitav.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/468d546725c3b10668702017ae00fbad/danavafiwa.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f60b69deef7---joxevapor.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/70360271190.pdfIn PDF document text
    • http://brukbet.com/user_images/file/72413780359.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b82b70cb245---51505705890.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16119da75cd108---suzagewikag.pdfIn PDF document text
    • http://thecobbfr.com/clients/4/43/4363d5a08aa72aedcf7f7d4dd0675897/File/13149810255.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/17066225822.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/27329de1ef7a295a061d9fa24e4903e1/sojetafiwe.pdfIn PDF document text
    • http://abroadster.com/files/bapukofapoxipatalujaraji.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/demofovegig.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609b66a0f40c4---19179782896.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/lezijukop.pdfIn PDF document text
    • http://vejwun.cz/images/xiwifafifoligimevolax.pdfIn PDF document text
    • https://datajournonepal.org/files/sagodogijobuvozige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=101+%C3%A7anak+okey+%C3%A7ip+hilesiPDF 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_off0000d0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D8 10632 bytes
SHA-256: c08c11247f9a96e86929255976b28a1def290855c9dd020dde437a5b218475d8
font_02_sfnt_off00010115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10115 17920 bytes
SHA-256: 3212e5bb6710e417caf258a3aee907260ec219c37a1213cda6bfd8b422181683

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