Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c4ad84966050a4…

MALICIOUS

PDF

83.9 KB Created: 2021-09-21 17:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: acf0d958e51fda31b7e28cb22735c498 SHA-1: a6769380fffe4040ddb2bc2bfaa80ba2049ff3e8 SHA-256: b9c4ad84966050a44e1c99dedef6f77b73fa5304306d5444fe4d26498e5f3f7c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various domains, some of which appear to be compromised upload storage locations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.champagne-auge-dascier.com/ckfinder/userfiles/files/31506493827.pdf In PDF document text
    • http://ilturismoinitalia.it/userfiles/files/3985722310.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/26910010914.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/jgcd7n5ej004f2sn2fouhtf4ut/68328085439.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/38624064894.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/30961699015.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210918185443.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f74309d4b7---47639718956.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/viluji.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/82702952581.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/rugukisuvelufilexerovep.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408906551cb---91591036679.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/vanugakaduzufavaxim.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/kuzexofo.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/40092480052.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/bawupevoxusodegefukivozub.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/davunuwej.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/pasenavajewalodaduxu.pdfIn PDF document text
    • https://rinducm1.com/contents/files/88289737643.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/badin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=watch+indiscretion+2016+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_off0000e185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE185 18348 bytes
SHA-256: c8cbe9a9d8b5b8655368e0724b5b890db0bb6224028daafa505661e70c97915b
font_01_sfnt_off000110b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B7 10920 bytes
SHA-256: 8d406c2e29d4bf06847e6071455158c81bab36ed9716450bed49de9e842948f6
font_02_sfnt_off00012a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1