Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55e0abb63fc5964…

MALICIOUS

PDF

87.7 KB Created: 2021-09-20 22:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 59850d8480407115183e1653998d9b3a SHA-1: b923d9599fe37d719b0bc469e1f888d3a792f3df SHA-256: b55e0abb63fc596454bfbbb9794cc2c06b6ca4d5f78d3f032c7d96696fba678a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm, with many URLs pointing to websites that appear to be compromised CMS uploads. The ML classifier strongly indicated maliciousness. The presence of multiple links to potentially compromised hosting suggests an attempt to lure users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 5

  • 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://motocams.cz/ckfinder/userfiles/files/xemezameretibogizepoz.pdf In PDF document text
    • https://ldoris.com/upfile/files/20210917015739.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161355af3a133b---98161192780.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202196161217.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/zobotitijafitutu.pdfIn PDF document text
    • https://perbloland.com/userfiles/file/pododimidatomed.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/63031305535.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/sevij.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/79c371d914761b2d5d48a50892c3f12e/tupijisokadisi.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/suketiwekusupoxe.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/kedamaxoronek.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/181443297084.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132ecf655de6---89112409157.pdfIn PDF document text
    • http://decorstore.eu/upload/file/jimuwazejosolobowena.pdfIn PDF document text
    • http://kleiberit.ru/files/file/55332116436.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/88963125872.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/10258491733.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/5542601889.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/xalopozapofonowokopetevum.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/36921780020.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/ditarepujigu.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/widexiniwizise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=www+rdxhd+latest+movie+watch+onlinePDF 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_off0000f007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF007 10880 bytes
SHA-256: f9ab6c6993525b6217b5e868ca7a3b54a15b85106b53812ea8ebc0a2438d7ffa
font_01_sfnt_off00010909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10909 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001211b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211B 18464 bytes
SHA-256: ffec24d63dcf936a87bbac7e5dd15bc1d479502bfb15b8c1e852c3fe266b29d2