Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c553edd18a2d3e…

MALICIOUS

PDF

79.8 KB Created: 2021-09-23 03:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 15d3ec12b7e4bac4028c1d9461d946aa SHA-1: 1bf59f32b5ee550df735aac541d18bcacbbc9f3a SHA-256: e0c553edd18a2d3ecaf3332c8563fe21d6a1145d153f72bea659ae4f51869219
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy to distribute links across many low-reputation hosts. The presence of external URIs and compromised CMS upload links suggests an intent to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=types+of+curves+in+maths PDF link annotation
    • https://abhrian.com/userfiles/files/sabavapofizor.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f9f9becc2---23805698473.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/22575963452.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/kifizinowukiwafor.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/wukexedipesirume.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/15848074805.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/70452033333.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210913_CCC85D1FE4A8E7AE.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/4155837768.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394fa4d2472---bareranososibe.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/14454997311.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/nufuboxiribarefatobafude.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/xugovipejamidirafexab.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16132d2bd729ec---japumadigogafe.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613630602bde2---69889224397.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/9622784687.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///41552675019.pdfIn PDF document text
    • https://verner.lt/images/files/vozukajevutomun.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/wedajulukinatales.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/pezononibetatudekowatuko.pdfIn PDF document text
    • http://tid.vn/upload/files/71179318024.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/nusoveb.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/578985fc63f613d2fb83444e12880060/90345391494.pdfIn PDF document text
    • 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_off0000d180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD180 17988 bytes
SHA-256: b97b7509a6f2f272d395b94dbcbc52dabaa4f6cb35d5ff6c3b76ef8fb66fcc46
font_01_sfnt_off00010081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10081 10940 bytes
SHA-256: 171780d656d091a7c8c49cc1491a546510e82ae4192b2e86db68a463213420cb
font_02_sfnt_off000119c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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