Malicious PDF — malware analysis report

Static analysis result for SHA-256 c62e18ed856150b8…

MALICIOUS

PDF

89.3 KB Created: 2021-06-27 14:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e8137398f0c80bf88c0b1cf6e67f14f SHA-1: b9bdc6a6d601ad4f2a6ac6a4ee6c5de276aacb32 SHA-256: c62e18ed856150b8df85d8666a84c70e88ba582aee3b39e1cd95b101d8db5ad7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • 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://alutat.com/data/file/31198789776.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a27a1d2d17---6595549046.pdf
    • http://hillandbrownfamily.com/clients/76964/File/98649738146.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a1b04395e---29683683376.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/28frmsl85pt0r8g1rrj7c29414/54467776136.pdf
    • https://ewt.cz/res/file/63699322772.pdf
    • http://dgjst.com/upfile/file/xikakid.pdf
    • http://evevoyance.fr/adh/.-/file/45686804469.pdf
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/rilafoledeke.pdf
    • https://cornerstonelaw.eu/userfiles//file/24438271911.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a111d3b7b56---woxonuzokituxowelokuleku.pdf
    • http://www.sec-ollivier-associes.fr/www/upload/file/85292937546.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b019bda41f8---vaniselomibixafut.pdf
    • http://tribo.kz/userfiles/File/nereniki.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/1cb68884b2ef45645cf148799de316ab/74672237201.pdf
    • https://dansobentre.net/uploads/file/78805490473.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4dd0bcabf---6045247651.pdf
    • http://akkoryazilim.com/userfiles/file/lizotegobir.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3ff57c7658ab492a6c93c38bcefaf636/toretatajalinavawoxirubaf.pdf
    • http://eau-msu.ru/ckfinder/userfiles/files/47933289203.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/01b088951ce24ff670011f711e38c666/gapujalefu.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/nho4ko30s5s0osutun9aaukdb4/seredonaginunakesojumar.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=resistance+and+resistivity+worksheet
    • 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_off0000f5ae.bin
21831f3ea32594709d10773283f6939adfaad0f281a7be81abb3bb1ec915cd3d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AE 18320 bytes
font_01_sfnt_off0001268b.bin
c707e6dfead80c7d784f2c51e133be22fb20314778e644e891a17666ec33e9b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1268B 10824 bytes
font_02_sfnt_off00013f97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F97 16792 bytes