Malicious PDF — malware analysis report

Static analysis result for SHA-256 b849b2a103b64e9b…

MALICIOUS

PDF

79.2 KB Created: 2021-06-23 16:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 43e6f49bc9267940db78fb1b3aa2ea4b SHA-1: e39c1965b24930283d9919721e33868b24736d82 SHA-256: b849b2a103b64e9b79b5d2914da41d94c2340c1dc20da7d633436259097ad7a2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm with numerous URLs, many of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The embedded links are designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8d2837dc4---kidowukexebukuxujubuz.pdf In PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/5e8aa6715cd7988fd8a06eea9c62dc21/suxadojafemutilevup.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/500dd0e536bcc5510af19044f49f6019/wupogefofuwebezirazorikog.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/gukemifivinad.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076e5fad13e0---29163141803.pdfIn PDF document text
    • https://cecprint.com/images/file/46343966656.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/260bb2b822dc2df5d8aa1be475e464a8/73174355777.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a00af74a8d---mujegowugelubopojojub.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/c4pjcpa08ki5d8mckeabqe6feq/63472157034.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/mofoporefebatu.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/96233be9067e7be5ef9fd4e51ba36c82/fogawuzimefaxoso.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f835a7ba---93967490556.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/be5ebcbeb19ce6a6b2a76f7379321953/fejivobawifujunebibesoge.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95494cd2bb---12667511869.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/2403bd32bfe62a4bf7cd71b0713ee27b/deguwusom.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/pujixazabinuwazix.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/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=double+replacement+reaction+labPDF 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_off0000f776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF776 5040 bytes
SHA-256: 6a7162039fec5ad3130b819f13c3b5797bfb1acdbbadb000120d52c910c18d93
font_01_sfnt_off0001087f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087F 12448 bytes
SHA-256: 5a83b97d7746f9aec72f58e768bcda3833ac73c1a3ad7a2ba6610530b2ea236d