Malicious PDF — malware analysis report

Static analysis result for SHA-256 2575e98fe4de8eed…

MALICIOUS

PDF

91.1 KB Created: 2021-08-03 00:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 289053b3e85857fd50815faa182afd87 SHA-1: c82b3e32dc2fbf7e073e9e5361ed6bf4737daa1d SHA-256: 2575e98fe4de8eed9388cbd4456fc7fe5f5b59160fda8275ef3bddd369c4cda9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious websites. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://meble-tk.pl/userfiles/file/38037624529.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846c3a4d2b9---49186781236.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e26d77b7e19---moritubokebi.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606efbb7a8610---wanojawufupanavajopus.pdf
    • https://personnelcle.com/userfiles/file/6307157107.pdf
    • https://biovuspharma.net/userfiles/files/6553535171.pdf
    • http://phillipsbricksalumni.com/clients/56168/File/xewamizan.pdf
    • http://jungam21.com/upfiles/file/1627588252.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/b1977b3ea0339832c77eae89e862da42/vubenabazirubeb.pdf
    • http://live-net.it/file/mafedisira.pdf
    • http://sisparts.pl/zdjecia/fck/file/87922064816.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/1bbd4bd3cf6a16a2d5cc07c3430a43ce/25952887735.pdf
    • http://primaneighbors.com/userimages/22237149419.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf397c325b7---23995491548.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/374ba20ecaa7ad211602efdf580749c2/70807339736.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/1lp1qi0rrtdl0t846oa9rclo4m/zuvaj.pdf
    • https://ap-qatar.com/userfiles/files/33293992020.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/dd9ff9275732b55bd25bdcd01c0cce67/jerogolelawifanewowu.pdf
    • http://zonazero.es/userfiles/file/9142980956.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/992fd034699a7897c2f29c769b93aec8/sesofirukekam.pdf
    • http://perrymanreunion.com/clients/f/f8/f8644f0eb9578147d5589f75b8c3e300/File/jufolevax.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e95889933---rupajad.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16098f60921b68---zigiredegojelufuza.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/9qvu3patma86sohcsgvmam515f/4662125956.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/81c71d3c66571c7fd980da62d6c0743e/99454951235.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=que+son+las+economias+de+escala+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_off0000fd70.bin
26d78a5274e952d449664de45fcd7b07bf82bab9cd206e5a5931dda894fa4916
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD70 10744 bytes
font_01_sfnt_off0001162d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1162D 16792 bytes
font_02_sfnt_off00012e3f.bin
b30d31c9e402ebb2f0f3dc2b444dd9287dcc7eb00c56445282beaf87deb1950c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3F 18232 bytes