Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e8df2276d34bc2…

MALICIOUS

PDF

71.8 KB Created: 2021-09-05 05:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a63a118448863c9ebdf12b8469492119 SHA-1: 7229f3d2a7fa652b0c3fcaa94aa53537cd06de17 SHA-256: 20e8df2276d34bc22fb902f73b426ef9fd2f45e3a47bc11df56f73778154a37b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, directing users to numerous external websites. Several of these links point to compromised CMS upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://agilesolutions.in/uploads/34109786840.pdf In PDF document text
    • http://elesi.eu/fichiers/files/67206056789.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/35010970981.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/ee574758c9bb4fbf3ab12d78126dfa67/fopipe.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/f9bf9f48abded5b461247417c35828fe/tufonijinedojeweni.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/ladofaf.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/a7ea985843d44a99a9382c7f4de0a115/22085778299.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/l5q1s35mcvgdbdt6ejpjop4nnl/73028478007.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/76060945354.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/62522220564.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/sogitirugexerexut.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/vnlfhklti129qq1vib1v914pdv/68040713152.pdfIn PDF document text
    • http://georgefamilyreunion.org/clients/86186/File/nonidagikusadepuzejip.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/tibikituteramoluzor.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/2da9d299b1f2679dc4938e55fbe4b511/pebawakovenixunidema.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-8-14/20210814183414763264.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/wexexulu.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/2479147e9c830f7d5634098f2e67df40/xijonaxopi.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/29948376099.pdfIn PDF document text
    • http://ooexperience.be/assets/Image//files/dobavegikejobekimuzebe.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/gisavepurabumarawinage.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/10315816214.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/4b68bcbc6d1e2185f2de828bb32185b9/17466764812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=fs-n11n+keyence+manualPDF 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_off0000b72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB72B 10348 bytes
SHA-256: f28a876e0ac2f6eb8616ba13249b888006687b657be8ab86b944a7b03b09c244
font_01_sfnt_off0000ce9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9B 16156 bytes
SHA-256: 6213f78965d0c7a8b4c2e4ae85a9a707683368860cf9ffbd9d71481bf6ab62db
font_02_sfnt_off0000f7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1