Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0d97f3a3e20a5f5…

MALICIOUS

PDF

86.2 KB Created: 2021-09-24 11:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 48fce576b4a38ce6bb4c73dd7e190080 SHA-1: 4c69696653d77f2e12a5c4d294201d9f3a68e51e SHA-256: f0d97f3a3e20a5f534a62375a38a3816fa13893f0728ed00bf2c172839403ab7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and numerous URLs, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://inwebjor.ru/uplcv?utm_term=capturas+de+pantalla+samsung+galaxy+s4 PDF link annotation
    • http://vo23.ru/upload/file/92309529633.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/54264569352.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/85799436005.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/17959300886.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303f2a8447b---23076260679.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/2tpm5boap0dafs20291v8t4faa/76204270071.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/tifigasugepalexijide.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/54752086557.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135f8df26b47---17073774266.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/fafugokavajusoxunisexuma.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210917011052.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/pinulevelugof.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/10018987077.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/toladurenokupekile.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144dc9387d90---82763228652.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/10034135852.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/15588278206.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/duxuzumokexisujosir.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109170759153534.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613c117322ef3---18060907746.pdfIn PDF document text
    • http://linker-apps.com/files/67758147119.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/baluduzowudesoxuzavere.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_off0000e70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70C 19376 bytes
SHA-256: b2ab0d46563eff424b91820b9eea3136b30c2a8748f830a68c47050cba18e62c
font_01_sfnt_off00011839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13050 10948 bytes
SHA-256: f1c60b314c5329b65a8b1f8209c96f8a6f7fc1a39032b53825dbdaa37be3f481

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