Malicious PDF — malware analysis report

Static analysis result for SHA-256 50668b36745832f0…

MALICIOUS

PDF

97.5 KB Created: 2021-09-11 12:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b3ed1794520a95406120f2ca6eda2890 SHA-1: 401b91a3f09d8d84b2418adfa5ed8762ed9fdc9d SHA-256: 50668b36745832f067eeba945d22c40a271b73a7dae65b4b0fb945b97dfd58fe
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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=beautiful+disaster+jamie+mcguire+read+online PDF link annotation
    • https://pypconsultores.mx/userfiles/file/18979567159.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/81096561369.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/32798745739.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/23813396615.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/11646291599.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/25873346640.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/a222ef186004bf9864402ec9b964db77/luzivan.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/dapijugoxoleke.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/50565435989.pdfIn PDF document text
    • https://capecoralliving.com/media/file/mawifatit.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/31412311102.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/pojagupanedadufidinasited.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/61703186514.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/56783239834.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/rogesudidaxijedidofaj.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/202198144930.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/a6331d59f09b2c4c83594692bd3cfaaf/pemibarajomo.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/g0iiqddmibpj5pj9dd93rh96q2/dezikiverajozamimofijosof.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/15921598471.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/jumoxomomoxawo.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135193409c66---sujivanesogubabanofuxobuw.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/62912575151.pdfIn PDF document text
    • https://magerp.org/upload/files/36106661712.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/90073349498.pdfIn PDF document text
    • http://konberdbio.com/upload/files/loxuv.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA8 11100 bytes
SHA-256: b75005a3e70a5d0ee0d4a87e2d138a3bdff45dd5a477befa32b0d686d587753a
font_01_sfnt_off0001184b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184B 18752 bytes
SHA-256: 0d83e3d5a22685e1f99a78fea8bf343d0ac97291cb3905c57c6215421c573967
font_02_sfnt_off000148ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000160cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160CB 16424 bytes
SHA-256: ef8701eb79685041ba51b48b3ed5be6a2743d899f5b89193a8f0275675b44e26

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