Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb644017c732c65d…

MALICIOUS

PDF

71.1 KB Created: 2021-09-27 16:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e98182b636e90d7a460935c54797a391 SHA-1: 46188a66a86b77021ad794b758bf2de8d78d83b4 SHA-256: eb644017c732c65d8ffab34f32970fc2709fa14394e2f7fbf8b364bb20b90063
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript and numerous external links, many of which point to potentially compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest the document's purpose is to redirect users to malicious sites, likely for phishing or malware distribution. The embedded JavaScript may be used to facilitate these redirects or further obfuscate the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://chizclean.ru/files/fck/file/batuf.pdf In PDF document text
    • http://taigesw.com/upload/files/19415805110.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613503116f6db---21550355648.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16150971e9840f---70580474500.pdfIn PDF document text
    • http://artio.pl/files/files/gesidopuguluf.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/67048684851.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/42358016122.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/zaxefugesobiko.pdfIn PDF document text
    • http://sunsoftinfoway.net/ckfinder/userfiles/files/tofimefogetibixobog.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/15250215877.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/xekedupijozamomanetosufu.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/0cee53881cd502db65832940d3048c94/jerutifepotega.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/25967437777.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/tesawefubukajolunusirexo.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/tozipunabiluxekekex.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/60282294786.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/tefojonuxo.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/45943696705.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210921001434.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/17280262049.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/winulowagewe.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/fatekululotaloweniduzena.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/jigomupusubifur.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/kupuz.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/winujoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=photo+transfer+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_off0000b310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB310 10412 bytes
SHA-256: dbb9804b527a90c92969e1461bde6c0504804aa338b0455a5b02307817cfafe4
font_01_sfnt_off0000caa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA0 17380 bytes
SHA-256: 83b0a7770298a195b13294802772fb7d9130acf2ebd677258887572be620b946
font_02_sfnt_off0000f757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF757 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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