Malicious PDF — malware analysis report

Static analysis result for SHA-256 cede1e00c245ed09…

MALICIOUS

PDF

76.9 KB Created: 2021-09-11 08:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dff18c35dea37bf244ca67cc4126b345 SHA-1: 6c4d76f4775266e41ee7000ac0a6d36d96a129c5 SHA-256: cede1e00c245ed09de1f0dcf1fc7314b79218699efbc4635e0a619e7711513cb
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to external PDF files. Several heuristics indicate these links are part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://littlepearlbooks.in/data/eimages/file/kuxezunidanevidate.pdf In PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/50217998805.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd420bceac---20741080909.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/dibezuzisowosedekutedin.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/waloxizagumisekadaje.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/2280611861.pdfIn PDF document text
    • http://shahgrp.com/uploads/73509448456.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/cr8pfqurk5qirc9fli4256vmg1/66031921501.pdfIn PDF document text
    • http://esistore.de/userfiles/file/sofugejazavugilakuxobovaj.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/ganotetopivuxenisivek.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/091436089019.pdfIn PDF document text
    • http://childprotectionindia.com/lexcyberia/userfiles/files/fagonadasidigotisaz.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/sagidegibaratiz.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/63620725632.pdfIn PDF document text
    • http://gameadvisers.com/js/new/fckeditor/userfiles/file/jemozenaxovovopa.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/wemenokojuninaj.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/4479827778.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202196858388865.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/47161869664.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/sn30g113irse40448be1ronep9/jomevate.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/51983701100.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/361ad08bcc9450e82658ceeca1dea622/99672874346.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94120995135.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/37205282871.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=dual+space+free+fire+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_off0000cd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD52 16064 bytes
SHA-256: 9e6f8fda728ee47451fec6ece7fde7a9addf2c6744962c3353816ac2795cecef
font_01_sfnt_off0000f630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF630 10344 bytes
SHA-256: 358a754ab602938826aa3e9d3152170faad27d9234f53a5267e14c9859092413
font_02_sfnt_off00010dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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