Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e8e8d225629e86…

MALICIOUS

PDF

69.7 KB Created: 2021-09-14 03:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0feb822c806fe4dec9acf752bdc94229 SHA-1: 3d1630758828aa8b1659d8d79132bd42fce54637 SHA-256: d7e8e8d225629e8616591b56da91b40e340b218031f37aba0d73ba618b7a9a51
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a link farm pointing to multiple external websites. The heuristics indicate that the PDF is designed to redirect users to potentially malicious or phishing sites, as evidenced by the numerous URLs extracted. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://philabc.ru/uplcv?utm_term=the+matrix+1999+full+movie+online PDF link annotation
    • https://inprovitcaribe.com/ckfinder/userfiles/files/25405963606.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613921f52d036---33479658291.pdfIn PDF document text
    • http://m2m2design.com/userfiles/rozagafu.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613699e899ca4---feramawajaragijujewo.pdfIn PDF document text
    • http://lovesenergy.com/file/39800786172.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/xapojoxafuk.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22520565648.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/61078086540.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/gowamewogesosawawik.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/5525274877.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///36940613129.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393956800f0---pixapota.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/lorokijadafovatoxijetol.pdfIn PDF document text
    • https://maturana.cl/upload/file/xixexuzugow.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/2924071165.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eefa559153---tezagizelububebive.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/tilafav.pdfIn PDF document text
    • http://inica.org/files/file///73950424631.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/rezosola.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/82086775278.pdfIn PDF document text
    • https://lordoptika.hu/files/files/dasinonivowom.pdfIn PDF document text
    • http://health-bridge.in/upload/file/97622175913.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/88546850502.pdfIn PDF document text
    • http://telecycling.org/files/file/5400150931.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_off0000b25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA76 10760 bytes
SHA-256: c3afb3730bf0ebd6af8616e50edbfa1761d48901b5f3e6e182c9c4c40b99c377
font_02_sfnt_off0000e31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31B 15040 bytes
SHA-256: 6e54bdd8943c3da1df14fae6e1c005ea98fa649bf9eca97b144261c6da2efaeb

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