Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c23a96aa3b86b39…

MALICIOUS

PDF

87.5 KB Created: 2021-07-23 04:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dbacfd957ddfd5b22e71ee99fe0f79e2 SHA-1: 25812ae03da87073948e913185da982abf7a854c SHA-256: 7c23a96aa3b86b39ad04c758343a9a2ee518a71ad443d6b9cb1368b85c9876a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm directing users to multiple external URLs, many of which appear to be hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The document body is unreadable, but the heuristics and URLs point to a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b426c09c344---44681439776.pdf
    • http://astorandblack.net/emailer/userfiles/file/80853518308.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/lj7rtmh0pcl2f7a2rtti7cv8d2/pidek.pdf
    • http://dush-kz.ru/uploads/fck/file/6024209109.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/b81db6bb100b2be4f5fcea4c26e40cb6/dirunaralaxawa.pdf
    • http://svaz-podnikani.cz/files/file/wunovidupavemibinaweju.pdf
    • http://work4shop.cz/userfiles/file/fobejaxajabopexe.pdf
    • http://mulherinscampground.com/clients/879992/File/16420168252.pdf
    • https://alakharia.com/public_html/userfiles/file/2645327678.pdf
    • https://shidoremicrosys.com/media/72660689416.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad30a577f70---pureruzemelewe.pdf
    • http://skikk.be/app/webroot/files/userfiles/files/gasukowinuxajakaxowifepo.pdf
    • http://remobudostol.pl/pliki/67942905623.pdf
    • https://thuaphatlaihanoi.net/uploads/files/dolulovij.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609daec05f447---47474790938.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/cc9cd8d71164e3d92e65d87f4ca51c4b/80073563501.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a3e24dcb5---raporilibetipekewekupew.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc4ec34de2---pifulugaxarurano.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/25v6smtvqeluu46b16k79hgc1m/97841111746.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/eeea7e7973c94c54d8cc82359d6148f7/31899695485.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/82275c20ebfa6c8386635395b3b9f9ae/12762811358.pdf
    • http://voijin.com/userfiles/files/99664689096.pdf
    • http://www.derbysignandgraphics.com/uploads/file/23657588326.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=snape+and+ginny+fanfiction
    • 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_off0000f58e.bin
8ec712346910d84a317f591e752158d6e807bb939e178dbdab013d9edf251aeb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF58E 16232 bytes
font_01_sfnt_off00011ebc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBC 16792 bytes
font_02_sfnt_off000136d3.bin
3b52c18b4e284a38ec83d93b58ed56e5225386b20f60754f394a531bac1008d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x136D3 10668 bytes