Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ba36617f52a43d…

MALICIOUS

PDF

78.5 KB Created: 2021-09-18 18:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 73070c18121879654199e85f0c40d2eb SHA-1: 63b96b2e7f7220fc35028bf735140c2467c1f76b SHA-256: 33ba36617f52a43d5f89330e590f696acdbd9760a94a1ec65708978215f50314
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The presence of an embedded JavaScript stream and a high number of external links, many pointing to compromised CMS upload directories, strongly indicates a malicious intent. The ML classifier and ClamAV detection further support this, flagging the PDF as a phishing or trojan delivery mechanism. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://synerfreight.com/syner_upload/images/files/dokotapabadobedewuzujika.pdf In PDF document text
    • http://a-xian-coat.com/uploads/files/202109151208176810.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411a3f83ed0---96369451616.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/mibejekuvabiganufi.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/gewiviwovor.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/34049588715.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/53247643219.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/91622542620.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/xojeleberirebelirak.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/73199373920.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/55268185546.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/36710464685.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e7727c0af---62908314230.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161302dda28f74---zodej.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/2141730310.pdfIn PDF document text
    • https://vitanov.rs/files/35612367485.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/49428999122.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/50207698097.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/nubofifiginafipuruw.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/xuminoto.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/nojipuriz.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/sirilumopatajaraxexus.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/38646260758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=bubble+witch+saga+1+play+free+onlinePDF 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_off0000cc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1E 11304 bytes
SHA-256: 19e55393d4dc04d9588a2c012838995668389c0be9a948a2995889b3c159b63c
font_01_sfnt_off0000e695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE695 17864 bytes
SHA-256: 8c67961066186412c74ce375a6d27ff247f777859c13805816956260d1be24e6
font_02_sfnt_off000114dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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