Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8735720475e41f3…

MALICIOUS

PDF

79.9 KB Created: 2021-09-09 16:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7333c98f636d130ce0d6b00bc983d8ff SHA-1: d5036b9d228b2462db0f915f8879cbc5c479cb38 SHA-256: d8735720475e41f3b9277e7496854a4075b23c4caa8c09697cdbda179dcb5b65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicative of a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://learn-atdi.com/uploads/files/95469085286.pdf In PDF document text
    • http://nemdanangpho.com/uploads/2021-09-09/images/files/diner.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/79190710356.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/59f1dcbe16381ed5cc4c69d5f68dfb7a/89569215447.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/pabenixulafuzonar.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/lopepofafejen.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/11662468959.pdfIn PDF document text
    • http://wamer.org/userfiles/file/lerokodanoloseribobu.pdfIn PDF document text
    • https://bauarch.bg/files/97811642632.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/1838171003.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/zifas.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/kufesenasogesoro.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133296b77bd3---jatafewejogowogajemadeso.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/lidakegajowazomigigod.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/lezokib.pdfIn PDF document text
    • https://mediaskills.rs/files/97426966982.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/dopofujid.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/nebemamekabevogepu.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/fexoniguva.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/labudonobov.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/19309586654.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/31390921938.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/d238b0fece9ed8b253335ddc51b0f560/mazugufum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=mutants+and+masterminds+basic+hero%27s+handbook+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_off0000d40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40B 11196 bytes
SHA-256: 2124e92fbc95352676e091d5b5f5bca6f3a4641ea37b2e6bead80c47badbe658
font_01_sfnt_off0000eddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F1 16912 bytes
SHA-256: 2f621416c3c8a04b8658aa4039e70b9ebbf242122f94bc7855e0dd325d72bf35