Malicious PDF — malware analysis report

Static analysis result for SHA-256 338ea36c4ff41f42…

MALICIOUS

PDF

70.9 KB Created: 2021-10-04 00:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 44106e79f2b9f05c6e98b94e56a86d0b SHA-1: 0cb13a0307a97fa9918c33e0ccf5dbc9d7e954dd SHA-256: 338ea36c4ff41f42b92e9ae73c3fe21d96aaca97835c15740ae5ca779cc75ab3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://chulintemple.org/CKEdit/upload/files/1997686730.pdf In PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/89306089632.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/12043329838.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/87793027835.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d313ca2031---lubelanaru.pdfIn PDF document text
    • https://www.ocnistudio.cz/ckfinder/userfiles/files/89627119547.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/bf63cbf21aa1eafa79577fe5060cbf70/29104908823.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/mofirowanejujidex.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/a43a4e3b3e05685b474a4ea941075d23/nutazopalowezopalivek.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/e2mo2prqgfomee3ockc812qgvi/kejiwubozejot.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/77110495236.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/86960614556.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/74496024789.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/072eba675b913df63554bd20933d67ec/tavasileponidow.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/kegilavimikadi.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/94442412978.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/mirogelil.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/82421823624.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/bunata.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/91558439443.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/dujug.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613790704473d---39458082822.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334fb186934---madikupojurexadew.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/11042317401.pdfIn PDF document text
    • https://iohrp.org/f_files/files/69044757581.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/47662011737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=drawing+on+motherPDF 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_off0000b48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48C 16744 bytes
SHA-256: dae3917e8904631037951ffa7ce4df1551b77cd4575f9eae4393f72c9b20f942
font_01_sfnt_off0000dede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F5 10428 bytes
SHA-256: ab17d78a4e9ed0f2a7ef01a2284c9740dca3e81b648615599449e0fdc6bc5eb1

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