Malicious PDF — malware analysis report

Static analysis result for SHA-256 729541a7ee2f3b7c…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 01:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a2c563fd284cbb8dde21c54c8c4e400f SHA-1: 1f5bf5b197a8b036a11e79429c2e37fa2bf78eb3 SHA-256: 729541a7ee2f3b7c2b5594f02c804ca45dc256ad0c562fa4688602398c64c771
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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 https://o2opr.co/userfiles/files/69634695755.pdf In PDF document text
    • http://gestioniarmatoriali.it/57137921215.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/30833083474.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fc9d35e32---togunusomijate.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/xixidawirapa.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/fimegawaxujaver.pdfIn PDF document text
    • http://findusafranchise.com/files/files/rinurizuxu.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/diguvoxixex.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cb0d3ac36---558079241.pdfIn PDF document text
    • http://logicamail.it/draft/media/penewodaminuturazeromo.pdfIn PDF document text
    • http://ruresept.ru/files/file/919410627.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/81763671301.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613be98f2e648---fifuguruganoso.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/7246340948.pdfIn PDF document text
    • http://debten.net/UserFiles/File/24630710013.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/35376167562.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/nifevul.pdfIn PDF document text
    • http://anpo.vn/upload/files/nesewogebose.pdfIn PDF document text
    • http://kechengchem.com/upload/files/pobuvenasitod.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/kulesa.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613e79913707d---6495439348.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/8686089215.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/pegubexeda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=watch+fast+and+furious+9+free+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_off0000db12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB12 10836 bytes
SHA-256: 1f42c090e6fe684c8d743153142c89ce1cbef333c4707e98992c60668c3cfc1d
font_01_sfnt_off0000f416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF416 18252 bytes
SHA-256: 263984eff546a2f257baa95b4c3dbddd11eb74ccf10dcfafb3fde06a0dbb8a55
font_02_sfnt_off00012406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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