Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d5ea95f5189d76b…

MALICIOUS

PDF

76.6 KB Created: 2021-09-06 16:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 79a41d4218bc9078efb21635d699bb99 SHA-1: a66237c81cd73434c70f323b7932b4eab7e184dd SHA-256: 0d5ea95f5189d76b8930f4d65ce1f5a9e60b45bf3dff67a5d02bec79f71c8e1a
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. Heuristic analysis indicates the PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or SEO manipulation scheme. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the presence of numerous external links and the 'link farm' heuristic strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/ba9098140e2c9109c76bb795293fe113/97062594777.pdf In PDF document text
    • http://megat.pl/uploaded/fck_files/file/42402487038.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/fetageraxoxesakupimagoka.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/28b07aqbc23bl02q510rvdcmio/22849623243.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/24866767709.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/nutadizesowivepixo.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a22703c63a---barajobufotijizok.pdfIn PDF document text
    • http://dallaslandscapedesign.com/media/files/39083114275.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/11536561820.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/6723587560.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/9vdbts9jql9dmriol2glkeq6k2/64195227592.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/jojemasafivevib.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/56926857745.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609c34ea2213e---80407186741.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f323433d1f---80447151862.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/68387294973.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607289d305eb9---refutan.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/wewamujilogedewebolatixav.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d52f219e95c---20030506453.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/70355499554.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a5054d078---javoraturi.pdfIn PDF document text
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/19939032339.pdfIn PDF document text
    • https://jobtiara.com/files/files/72524081590.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/aee2793af1714fc4bb7b924e81c7ef6e/fuwigopoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=psychological+safety+google+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_off0000c6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF02 10808 bytes
SHA-256: 246c0eefd56ed2258afd4a2b888714717cedc0a8896cbf803c821db417cd7d81
font_02_sfnt_off0000f7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EB 17372 bytes
SHA-256: 9c18d98cbc82777b982f5b871f2796deb9206f61ec111be487b94de2da9f42a1