Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9288ed988a9226…

MALICIOUS

PDF

72.2 KB Created: 2021-09-09 10:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 581d1f2ccb8fa71efe9a7276b937b077 SHA-1: 3e02b073d0d4828976d0017d34152d7049b25a91 SHA-256: bb9288ed988a9226f095644cb735c3b40238470e49182fb0b95d3e37aafc6745
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to external websites, with several heuristics indicating these are part of a link farm. Some of these links are hosted on compromised CMS platforms, suggesting a potential for hosting malicious content or redirecting users to phishing sites. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://gloria-eurex.com/images/blog/file/74101272559.pdf In PDF document text
    • http://sten.kr/club/data/userfiles/file/20210907175716.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/zobepozux.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/xumapakez.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210902151813_cyxk0x.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/xodijepamu.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/14271565899.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/62958847384.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/vabejamavevozawivipoxe.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/56065785417.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/41844355440.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/ninadakufipudufutogedubeb.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/91014479816.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/42976079194.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/39807419039.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebbbb63f42---vuxizuwamolabekepowu.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/d555af62506445b31bf319f01cc69e30/xixufi.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/88680433230.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/momogumoge.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/3ea3dd1cc427d88d6c7ee3de458b187b/wemasesotelan.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/vjgenajhfb7okg8cfl8sav0bd4/45602460438.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/tuvomefewibujafivil.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/rozizefomumiriru.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/94777804052.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/wolorigomasijefanatenifuv.pdfIn PDF document text
    • https://paradigma.bg/uf/file/xanoputujesewujelaram.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=mirror%27s+edge+download+apkPDF 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_off0000b76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB76B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF82 10672 bytes
SHA-256: 41ff41954b1613e8b78e0bbc1f4d052dc05d349113dfc27e9a26a77793f6602a
font_02_sfnt_off0000e7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 16864 bytes
SHA-256: c79fe4063cf884fb6d0c34adf79a2f0b53653b2143bf5de3119f2cbf515ac5fd

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