Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05bd2e42e07341d…

MALICIOUS

PDF

112.3 KB Created: 2021-09-03 06:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1608dfca97f31267a977951dfb27b64e SHA-1: 6bdf639c86e4aa42f21b1ec146746826c4ebd3b8 SHA-256: c05bd2e42e07341dc142b94edef20855a1942259b9574f5efda03c75ca98a89d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ises.ca/phpsites/vertical_living/uploads/file/xujeleroxaxenet.pdf In PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/a00869153e4428fa1764fddc2a0ee881/pofawixipotibewi.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/53099153193.pdfIn PDF document text
    • https://yuktogel.com/contents//files/sujitufimaganojo.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eed2276621---nasanaba.pdfIn PDF document text
    • https://aedwea.com/upload/foto/50404148827.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/78657931188.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/rukamene.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/26720873830.pdfIn PDF document text
    • https://brakos.it/file/45100161361.pdfIn PDF document text
    • http://guitarenko.fr/img/files/kixelegoxitewifa.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160721c9a08053---likofovo.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/28898002847.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/68235738794.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/d4je1d84a3gjvtifcj0o944sen/89944880911.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cefa39ffd---valubo.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/22078511939.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/006b544df1819a1e3017d470b7e47ff9/26353757842.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080300978938---vozeba.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/gofopira.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/17166340716.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/dugomaku.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/gananetabefojitop.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/c9b72358080dae6ade6a0471bc7e1bf5/46219810610.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/mapebibojetabovotositavol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=christ+alone+cornerstone+chords+pdfPDF 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_off000150e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000168f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168F8 10748 bytes
SHA-256: 93afdf5b2634ea342f0784c75fc4b569996d660e20554f06284268daf6603af7
font_02_sfnt_off00018198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18198 18996 bytes
SHA-256: 3a05a47a9b748a6b0152cc3bd5fb892ef5b8be0b5ded39f3438dc5ac56c44e7c