Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb0d4f8ef2ebbc2c…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 14:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1a6a2f8d4946388a268420c5ac047edb SHA-1: b199dd2caf1114cd842dba6e27940ee9d8588a1b SHA-256: eb0d4f8ef2ebbc2c26aec994d3b3131301a3a9d16749190cd6ba4407abc91b28
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crysiq.ru/uplcv?utm_term=amelia+bedelia+means+business+pdf PDF link annotation
    • http://somkuthyoptika.hu/editor_up/wikukux.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140148522eb9---56643161492.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/vorinepadedi.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394fcaa4402---wutirapojatuv.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/mejakomokakikulenu.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/nudirogodenukupifokajul.pdfIn PDF document text
    • https://capitolmodels.tuzonanet.net/userfiles/file/57820240622.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/30380140863.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/zuzopu.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/74334227413.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/lovanoganin.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1630466993nobowirixoravisoweni.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/tonawizibalaxipalixib.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/84036818199.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/49913402623.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/12755868413.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/babaxeruropivipuxad.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/tudop.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146625d09e60---64398718840.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/90737522570.pdfIn PDF document text
    • https://jss-moms.si/upload/File/xovizibamowelaw.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/99559141747.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/3ef9edfbf59182bd2a4761bdcb8454ac/37719055714.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_off0000d7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A1 10560 bytes
SHA-256: c57c9d162702fa41896580572bd3cd6b23917ad5df5caa7f7f983b909d205df6
font_01_sfnt_off0000ef68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001077a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077A 18836 bytes
SHA-256: defb5a69e83b879eb13beca3e7dc037fe2a3cf59ca9f464cade3fcbd52338854

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