Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb815a428b9259ee…

MALICIOUS

PDF

89.0 KB Created: 2021-06-28 06:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a5482e277dbb7b46f7be0c0bc913dcb6 SHA-1: 205e0f4bb83f9b72b5faf18d70433c6a22606062 SHA-256: eb815a428b9259eef0bd4358db4ab5fc60c9f805eb663b86532cf27264dad4b0
96 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by an ML classifier. It contains numerous links, many pointing to PDF files hosted on domains associated with compromised CMS uploads or disposable hosting, suggesting a link farm or distribution mechanism. The presence of these links and the ML classification strongly indicate a malicious intent, likely to lure users to malicious content or for SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://sequirk.ie/userfiles/file/fovokafuzonawamizalorux.pdf In PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/69024929426.pdfIn PDF document text
    • http://canoeing.by/pics/files/25565740829.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608511aae3329---10604870708.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/23813072727.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/q7h7d0hdhgl4q46amk7gjnd592/66716259608.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/65539292360.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/66770334525.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16083ac2663dbe---30636397205.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/19514371963.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/ishkbnc3qfoi0anomsutdu7lj0/88826842913.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e1231ca9b---28818167899.pdfIn PDF document text
    • http://firegallery.ru/img/upload/84097371521.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/rasuven.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080e33aa81aa---14779603795.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/57565143936.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/87ebf2805dea89c78b012610a1aa9092/56320466881.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d5f78cec1be221199ba6d0845e994cb5/runuduxilosesireko.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d635b085e9---tofejepamarozajija.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/p30h1a09er6mlt04m1b42rvq1l/89947338509.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/rubagofurovowi.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3968ddddfc---gabojiwajoxubaredunepuror.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b661beb281---92885507016.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/31f710ae36f634602506ccf1d2e2402d/10827988629.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/9290990215.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/zejenolobavodisetudo.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/8449758917.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=forming+nouns+from+verbsPDF 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_off0000f81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81D 10532 bytes
SHA-256: f2a24d67207c63e96a7982c4df56bdf97e7d9d74fe26e885bb37f35b98292726
font_01_sfnt_off0001101a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101A 17344 bytes
SHA-256: 3b474a71fc1de25f32d8d51e37b1e36ceb861d08a6960b5ee6dd0d27b79e4b80
font_02_sfnt_off00013cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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