Malicious PDF — malware analysis report

Static analysis result for SHA-256 2456fc7768b1cd06…

MALICIOUS

PDF

70.8 KB Created: 2021-07-01 14:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 43773453ff929953f399622e940f2c44 SHA-1: 52d40cde95303a27554db21e66c581f57c1b7f8b SHA-256: 2456fc7768b1cd06123e0741a6c2323e23c58d53576e8f965e8f06883759dea6
156 Risk Score

Malware Insights

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

The PDF contains 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 link farm strategy, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings strongly suggest malicious intent. The primary goal appears to be redirecting users to potentially harmful external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=does+getting+too+much+sleep+make+you+tired PDF link annotation
    • http://ipllaser.in/uploads/xabixubijumenu.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/vepimatemovunapilofaresel.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/5e06c9f0282dd2fe85026b834e58abd5/21482493057.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/vuzalexezisokagilojawudew.pdfIn PDF document text
    • http://thedreams.cz/files/72988742113.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/wazesogazofa.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfbe42b6c9---84470905809.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/699530672fb3eb11dde2860a318c90fa/46846937515.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/nmdom44hnbbtlfff8kfgvk1u0o/boxiseposabuso.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/88131133735.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/dukogoxepatowebixajirag.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/kurotiva.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/1fce8e678568a48fc952b6b6f3c3f956/62059750727.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160837b8f66baa---39901231558.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/adf1f282a01ab6a6776278618de37df3/27201482624.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/30259375370.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/16964054636.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/853a5159beedefca0bdef9a17d4a824c/51910563470.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/26384645252.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/0d681446affdab64c2a36f54eb2dba9b/38699019988.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/u6sqe1ur6a5adnt305m0otfmcr/61515325338.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_off0000b4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C4 11268 bytes
SHA-256: 1bcebd6b5e42dd12d9b7a7c8e7b87f26dfcf9d12ea2b8b2cf93b915341bdce4a
font_01_sfnt_off0000cedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6ED 15292 bytes
SHA-256: 4d9bc3a0d7e7f7dea0a31b0c347106eead872318b416b72cb81ae09658c03388

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