Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfbe78b6dd534aba…

MALICIOUS

PDF

85.2 KB Created: 2021-10-04 22:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9e88b30193f2dd6c261e30565705b6a2 SHA-1: 58c5b7403e73b8e624881888c77da2434bd03c09 SHA-256: cfbe78b6dd534abae1589799329fc62dd40e7a36f6b54f5e7958ca6c1735e72a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting domains, suggesting a link farm designed to redirect users. The presence of embedded JavaScript indicates potential for further malicious actions, such as downloading additional payloads or executing exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://candientushinko.com/images/file/mevilusirijitafubolevinuf.pdf In PDF document text
    • http://nuovartea.eu/userfiles/files/71795366600.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/luwuja.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/56275113274.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614bbe1ba471a---bamevobetuviwupabipave.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/jirurorovupakiw.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/muzapegagoxirutirexemidum.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/74121462345.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/23522221948.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/gaboridonul.pdfIn PDF document text
    • http://proart.by/media/file/9479629184.pdfIn PDF document text
    • http://373113.linker.tw/files/93744908402.pdfIn PDF document text
    • http://devison-matras.com/upload/file/67498216914.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/37886771373.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/73864251254.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/rafafa.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161383a3a3625c---33652710903.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/d12b5e5c217021359a48bbae8c2fd956/mesegetigijokixiweb.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/10694571200.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/bexutorujuwejesud.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/14069874493.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/33336428076.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/cf23b1dbc17d1f1de194ff66ae6eb134/bagufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=sausage+toad+for+2PDF 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_off0000e1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F5 20224 bytes
SHA-256: 18bdff992fe8de24da955655b1ed0cc7e7625da4a912146ee16d8692c9335e44
font_01_sfnt_off00011601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11601 10584 bytes
SHA-256: 065fe204c10166b82f25315fa43d4ff772d76321e734a6e3f9271b7b1f008367
font_02_sfnt_off00012e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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