Malicious PDF — malware analysis report

Static analysis result for SHA-256 430e83a1297d172d…

MALICIOUS

PDF

73.3 KB Created: 2021-09-27 23:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d0de3199ae700aefab3a94b2503db40 SHA-1: 4409bc60641cf48b0b63195a93afa4d87d99ecf7 SHA-256: 430e83a1297d172d4b6ff679ddca76b88ea970faade2b6e9a1e60c231cdc28db
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 multiple distinct hosts, several of which appear to be compromised CMS uploads, suggesting an attempt to obscure the final destination or leverage trusted domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/js70o0buds7htiqr5k3jga83ig/mimojulimab.pdf
    • http://thietkewebbacninh.com/webroot/img/files/panenupasevi.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614252ec48d13---xupemitirunoselofomunux.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/4090376821.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/61cb33077d1a90d138e06b3bd6af8be9/muxubajakatejolesarapo.pdf
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/naxazozopadavo.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ktac4glpqv09tfoicntu4u2ds3/4751088987.pdf
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/vexujejevinel.pdf
    • http://musorcentrum.hu/files/article/file/wixatipodevit.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614af727e90e0---juwotojatujivipixene.pdf
    • http://studiobaliva.eu/userfiles/files/99732202406.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee29a9f7f1---90473637354.pdf
    • https://cvssteelex.com/ckfinder/userfiles/files/morofagurajusiw.pdf
    • https://hotararicedo.ro/files/files/nitelabefe.pdf
    • http://vnndt.com/Images_upload/files/86225058634.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/64dc17bf89f64801a7d1b87c89621a30/93736062662.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6b8ec6ba7---dajezabetekirubumubiwumuw.pdf
    • http://monticellotownship.org/userfiles/file/jijafulaboge.pdf
    • http://lukoilmarine.com/ckfinder/userfiles/files/46838145782.pdf
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/61672984109.pdf
    • https://louvre.lv/res/wysiwyg/file/bujis.pdf
    • http://divelife.kz/files/file/biwanudomirexinakave.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+retrieve+deleted+photos+from+gallery+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b60b.bin
33adc9ac004b47550dfa15e70b0594936b2ccfffa1baac593a17ea30b5875268
pdf-font-stream PDF embedded font (sfnt) at offset 0xB60B 11200 bytes
font_01_sfnt_off0000cfe7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE7 16792 bytes
font_02_sfnt_off0000e7f9.bin
3e47425af2ee39428a8060c175de703cadf666a9e39c7ee5f1e2f380ea69d46e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F9 18544 bytes