Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff07a6fafce3d277…

MALICIOUS

PDF

76.1 KB Created: 2021-05-25 08:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4862082ab06b7ec91ddb65c67be95a46 SHA-1: 4ec16a6d52cd4d7933ab84429cb6ba51625e4673 SHA-256: ff07a6fafce3d2772e7500b88c44ea55f8ebe4111e1f714ed2457c3160c79e11
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the PDF structure align with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/3e296439c020315bfb8f481aa61a239a/mitupi.pdf In PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/2e9f20dfe28264d334b3edbe7eaa7f8a/jisosafexil.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/l8cm7gmqd5f0vtnkk29jqhjd0l/47807442433.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/noxub.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16094efd62a0de---24311205208.pdfIn PDF document text
    • http://dgjst.com/upfile/file/2540645039.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/2c3e2d1e6e25e6d3b43aac8abce6eeba/dipunavemiverufenitidinox.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aabe85dd460---60665247713.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/8047dd75a84ba2cce7026c2e3393c6cc/43147019257.pdfIn PDF document text
    • http://menafundinfo.com/userfiles/file/fenuz.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/32505171b84ddb5ce522692cdfd9ac73/79820113096.pdfIn PDF document text
    • https://bloomeng.com/uploads/supidovov.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/potigepiwatenezotosatob.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/jojajaferi.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1ad8070a---92697185738.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/672c4f9d650c2c7d354d9cca8920b608/jesalizigesufapadejagotu.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/ab94daeb15731d1632cf0a0cb5ad77a2/jotuvudelepajepuwosetu.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608802e2e8d37---bevoziw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ejemplos+de+formula+estructural+desarrolladaPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99F 5336 bytes
SHA-256: 49e8b1dd8027837feb47f52ab2a579e6129eedddc1706b486e2e3e194e8ee06b
font_01_sfnt_off0000fbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB1 11632 bytes
SHA-256: eb3867f65b3eda6313585241632763d28055dc99367cf9b6b78597e985dd69b2