Malicious PDF — malware analysis report

Static analysis result for SHA-256 e22e57435a93d83f…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 10:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 59c6dffa4a1451efb2b79ec4758ead44 SHA-1: 2d7f6b70e1b05ac3e36dcd923e8396e1fcb72143 SHA-256: e22e57435a93d83f25c630462624a26cf71f2e41e23e313fdb0937e316fd8b59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous distinct hosts with a single link each, often with UTM parameters, which is a common tactic for SEO poisoning and phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://laborke.ru/uplcv?utm_term=1k+likes+on+instagram PDF link annotation
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/vojoxumiter.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/210911113756883904w63u7z.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/71181881605.pdfIn PDF document text
    • http://onlinevay.com/upload/files/5261691517.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/muvizireneluse.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/92312850526.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/gupiwupol.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/70732641471.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/34886959282.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cb0a45e25---foxegepanugugujefinad.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/werof.pdfIn PDF document text
    • https://goodline.by/userfiles/file/30412097533.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16135e79e5353d---90734694798.pdfIn PDF document text
    • http://packamate.com/userfiles/wabare.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/18301211399.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161362f6f568fa---89651210627.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/82606448774.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/hg23ifgnkn65uidq7m09uvbmu5/48922657672.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/78890199723.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/26826137648.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/xunotiz.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/boxobifuratutosokoruge.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/3d7daf7dea3fc39abddff0b0cf5995ca/48140694164.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_off0000b262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB262 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA79 10496 bytes
SHA-256: c5657f920890fc2cbafce166ea84c0de20e1d5cdcea4f1cc2c7c3ba24b807be4
font_02_sfnt_off0000e258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE258 15136 bytes
SHA-256: fb1b3dc508c961c7c9d42365f11866baa657545c0964e958e0430dc900b560bf

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