Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28bacd2771f8258…

MALICIOUS

PDF

71.7 KB Created: 2021-09-27 18:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ac7b0ff180bd074241c6cca6927ce88e SHA-1: 88b6a86033735b04d4925768bbefae04de53bd21 SHA-256: f28bacd2771f82582a7035493d949189baa2b963bf2c6a8707fb63059b1c5585
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are structured as link farms on disposable hosting, suggesting an attempt to lure users to external sites. The presence of these link farms and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=rise+of+the+roman+empire+mod+apk PDF link annotation
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1d8298199---54516015585.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/93615180729.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/17251423245.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/6054977294.pdfIn PDF document text
    • http://cwesp.biz/upload/file/74955575403.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/wazibufofo.pdfIn PDF document text
    • https://phunhai.net/upload/files/vimaguxujewededilaz.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/7e22c8e529d0b9ccccdcd101ba12cfb2.pdfIn PDF document text
    • https://halkum.rs/files/10975931949.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/29449a781d1ce2f0702a06992498c205/889992171.pdfIn PDF document text
    • http://geodez.com/pliki/file/bifemopuvuzijitenepijo.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161495da977622---fegaxekovusipoba.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/boris.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410fd377f4d---zafiwuzak.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/xafukulumoruruzexifaji.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/duzapuz.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b67052996---wokegajofomi.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/vazonugujibipawu.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/78282035750.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/xewovareb.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/zuxixemuwapibufujetimi.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/sivoninovoterifinir.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/75321746450.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210925101242.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_off0000b4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B4 17220 bytes
SHA-256: 95ff27015c36cef36114ef210b7ddf739c90ea0bfb19450c1d7789f8032c488e
font_01_sfnt_off0000dfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FD 10852 bytes
SHA-256: 4eb978533097ee62b8a1b081a8b20efbef80beb047a624622b372114079f71a5

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