Malicious PDF — malware analysis report

Static analysis result for SHA-256 e70b13c61bcab872…

MALICIOUS

PDF

87.4 KB Created: 2021-09-19 05:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e203d5918aee777f5e89e24d62e9567f SHA-1: 4a313d8dc0b0a3f2fdcdb818306ad6120897de91 SHA-256: e70b13c61bcab87266b54473836317ac6573f5692543bd3f91a315f12d580acc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, with several heuristics indicating it functions as a link farm hosted on potentially compromised or disposable domains. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user or download further payloads. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://polipadel.com/userfiles/file/84022421757.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614698b58bbc2---bewututagal.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/99377349899.pdfIn PDF document text
    • http://change4best.ru/upload/file/jalevadupirexuv.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/6ddcccf18b4a3fe434bcddf713e60918/52470220559.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/dafolubisiwulaloxuvoxilam.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/91817741676.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/94622834239.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/57703277913.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/8179835825.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/86320453262.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/6204772427.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/guwodeguv.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/vijosubaxesoboxepulufu.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/sorinofisivepofatonima.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/zevakajorusiveper.pdfIn PDF document text
    • https://fond.ru/userfiles/file/95667618586.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/89346503970.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/33280382726.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/12247689778.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/15111458605.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210918191145.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/gefidenuridezalegesa.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613777f718ccd---pugumusalaluba.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/verelimaruwo.pdfIn PDF document text
    • https://nls.vn/upload/files/nozasus.pdfIn PDF document text
    • https://mlspoland.co/files/file/fajojunesojevev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=youtube+app+for+android+phonePDF 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_off0000f181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF181 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10993 17844 bytes
SHA-256: 6d59bbe20056bedb0f8b11d9873fe514693728b27b45b8d753eb6bee16c78600
font_02_sfnt_off00013843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13843 10604 bytes
SHA-256: 3086772fa8f6ee6ffec2ea1a022f3f03e2a5b9d0c79675bca8c0041ca84bb79f

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