Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a9db4cfecb0bacd…

MALICIOUS

PDF

89.1 KB Created: 2021-09-04 19:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b46d7302edea89b429f5e2106d8f4634 SHA-1: 065c13db97264db47a7509387bc1fcbbb650e0b8 SHA-256: 1a9db4cfecb0bacd3c47345cd28ece96bf4833b23c9a84017a9ff56d2d151fd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document delivery, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://edinburghpools.com/contents//files/ninisojugag.pdf
    • http://bibliotekaludwin.pl/img/upload/files/xukuk.pdf
    • https://thehouseconcert.com/ckfinder/userfiles/files/12349534165.pdf
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/6097289442.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/56038668276.pdf
    • https://mygenius.ru/admin/ckfinder/userfiles/files/48718229409.pdf
    • http://mgtofubbq.com/uploads/files/megowetowudowepefali.pdf
    • http://beiwendq.com/data/attachment/file/ragevup.pdf
    • http://fsanaq.com/upload/file/210722211235825420h4v3511gl4jg.pdf
    • http://pileshoppen.dk/userfiles/file/ninuvalajad.pdf
    • http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/batetekalesixiloti.pdf
    • http://mmbc.cz/_data/user_files/file/51926879994.pdf
    • https://kfk-dekoration.dk/images/uploadedimages/file/5917736980.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608586b1f0c5a---26792719428.pdf
    • http://emeraldcovepartners.com/_data/images/file/nujebaguvirureludujoki.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/l87j55vc0nio0l73ftj656791l/vowubovitom.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e871fbbfd17---68164380848.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/86c7f3d48328e8d0e29213dfd1d1e007/jesolab.pdf
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/63678784793.pdf
    • https://hoavily.com/uploads/files/xetofoleke.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/c535a1d2be1ee2022b560f5515c9942a/89120743172.pdf
    • http://starlightcelebrates.org/clients/4/43/43e9139217482d7666ce300faf566241/File/23987070388.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=casework+skills+in+social+work+pdf
    • 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_off0000f538.bin
b6597f530b241b3a482ca21bc34a2e81433f0e3ae4dc84f4500cbc06c6905fb6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF538 18568 bytes
font_01_sfnt_off000125f4.bin
295bdb5299b2355cf4cee7d7a4fd9a23ca1a00ea142845b6239f449dad4ff7f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x125F4 10724 bytes
font_02_sfnt_off00013ec0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC0 16792 bytes