Malicious PDF — malware analysis report

Static analysis result for SHA-256 e774c0dbeb163e13…

MALICIOUS

PDF

90.6 KB Created: 2021-09-18 15:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 76eafb1fa5701eca1c314056df1cfed7 SHA-1: b1800ac2b5e4f179586959254dfdd3d320cede35 SHA-256: e774c0dbeb163e13661816db00cbe6062034da2f21f5135f54671ae05147712b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://medvor.ru/uplcv?utm_term=transfer+photo+from+android+to+pc PDF link annotation
    • http://meta-min.com/files/10432785941.pdfIn PDF document text
    • https://actorconseil.com/files/file/96534774074.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/73813529474.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/ralimep.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/43999585509.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/5143066679.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b77a5ef88e---68795983509.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/patuwuwen.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/a1595dfd8f807848603f1dac354fbd0d/dejuboliroje.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/fujesikomi.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/zejavewu.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/90806214134.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210903072014.pdfIn PDF document text
    • https://eventaipei.com/upload/files/53843616111.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/414567553.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/gefitawibew.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613875db78cb0---21634647457.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/xotabujaza.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/sonepisura.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/majiwudaperojenig.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/tosojomumetinek.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/wikajadola.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/pudekiwagebojonujin.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/34928259318.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/neranojeduzatotigilifik.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/57813785130.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_off0000fe9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9C 17408 bytes
SHA-256: dab6231c55403106c13355d1b145f5d7fb708a6b211047e03de24963d425b314
font_01_sfnt_off00012bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB7 10800 bytes
SHA-256: 5079a6181cacba8b3c4211a1e83bb81530d4b51809d6fe63d9c143129494e127
font_02_sfnt_off00014469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14469 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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