Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb4c7e4df5b4c583…

MALICIOUS

PDF

82.8 KB Created: 2021-09-21 20:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8c2438c01f713d3e7108a73fac3aac7b SHA-1: a6df7291fd4df5aa782a808fef871fffb9ea0241 SHA-256: eb4c7e4df5b4c583f3877c3d1458e695ecb25cce312085b666883e259c57538d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded JavaScript likely facilitates the download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://pistant.ru/uplcv?utm_term=read+a+document+aloud PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614762de30b97---24543917419.pdfIn PDF document text
    • http://word.mn/uploads/assets/15702677589.pdfIn PDF document text
    • http://armanetti.com/images/tomamijuvivulobo.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614360a0627cc---7784349604.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/gurelelifawukilu.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/sixezanalevidexegagu.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9b2c2eda1---sakavisiporuroliwiral.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141da35289be---silesifusonobusun.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/5c5673d166d1e1931fdb7a56d377a6ab/vazojisogez.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/48318587843.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/69891966921.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/pizulabarugage.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/lerefuse.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/xamefobaxiwerez.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/rividamafugemativa.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/b7b539b8f5963e8617878fe59b5112b7/17880399079.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/gokozikixu.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161416f02dedfa---77588655900.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/jutipow.pdfIn PDF document text
    • http://boq.internet-match.com/upload/files/kirozezizetakevuja.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/pofawivapaluf.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/xomogoviviwepekolowo.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_off0000e14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF962 10316 bytes
SHA-256: abd526c46b292653a57d35b6f6f9b4b7f8ef68832e2ff9a83e77b04b7fe290e0
font_02_sfnt_off00011098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11098 17688 bytes
SHA-256: 5c704e393e8290069664ed145ffbc5b1164b55e60f1e78ab0903f371d68a7856

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