Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b849ddd068ac92…

MALICIOUS

PDF

74.6 KB Created: 2021-09-01 21:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d93b5d8d9ed6907137d7bc4d9fa7c096 SHA-1: 701bddef543035d3baa7fce9c5706bb8f26e4e81 SHA-256: 28b849ddd068ac92e83f4d36d44fa17b5b50d58c4a8f49c75de50e61a89c380c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDF files hosted on compromised websites or disposable domains, indicating a link farm designed to lead users to malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. The heuristics suggest it's a link farm on compromised CMS uploads and disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/d2f786f7c3b3b22d3dd97ea09f5e0ead/97992486586.pdf In PDF document text
    • http://coinproject.com/userfiles/image/file/gemejubijutafoxefesozixe.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2a2bbb88d---95453919854.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf46f501dc---xopod.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210702_7540C97658ADF249.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/52542971796.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/asigisareboru.pdfIn PDF document text
    • http://scro.ru/pic/file/wezuzumeju.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce0c64019b---88626617654.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac080598b4---84354726603.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/76772057368.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b9083443bcd---vilutokifon.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/b58e03db9c8737dcbf6bcb4ed31ed80e/43511996856.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/e073681695db3dba600ecd247122bb9e/gumoxip.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/95806287030.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/darojiwagezude.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/32404818a21f0a50f157f873671029d1/kogumipubokowesev.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608612f6751b7---55960011553.pdfIn PDF document text
    • http://capital96.com/userfiles/file/bisomo.pdfIn PDF document text
    • http://hpmcfamilyreunion1968.com/clients/83891/File/nopefofilidokabulupep.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/3181632385.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/44346534376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=associated+broadcasting+company+private+limitedPDF 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_off0000bdad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BF 16316 bytes
SHA-256: 14e6d4b219ff4670e2c9f157e51ef294794e3e8029050a954f75267c1ba6ed72
font_02_sfnt_off0000ffc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC8 11160 bytes
SHA-256: 7cd4b4cdf68d4dec30263307fb3450bf4b1539923a897d8da14566f9ab0455a9

Open this report in the interactive analyzer, or submit your own file for analysis.