Malicious PDF — malware analysis report

Static analysis result for SHA-256 00376d7e5fcde7a1…

MALICIOUS

PDF

74.0 KB Created: 2021-08-24 14:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 866240aff0d8431e690e46d9d192517a SHA-1: 5bf77e7f456c29219299a428085679812b71d743 SHA-256: 00376d7e5fcde7a18f50d02bc7eb657356171817e2360cac7b0c772888ef0797
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfcc47ee15---faxakakexapekosonuzaw.pdf
    • http://ongxoanhdpe.vn/upload/files/81077050033.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/344acdbf4303272c7c3d3c7f387ff301/98334416716.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849394e7384---sefuza.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbe30b3e48---94937949122.pdf
    • https://ehotelgateway.com/bot/ckfinder/uf/files/68246939079.pdf
    • https://ihappywash.com/uploads/files/202108240043536323.pdf
    • http://nuovartea.eu/userfiles/files/legujatewep.pdf
    • https://cuisinescartier.ca/upload/editor/file/tewetetusoleda.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/ir58065b89fg4jdfu6f755ebgu/votinusadewude.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbc0c9e717---97817169851.pdf
    • http://atenngo.com/admin/sites/site/documents/88056172188.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119b52032a59---romapuwonuju.pdf
    • http://sklepjola.pl/userfiles/file/4001174628.pdf
    • http://tz5168.com/uploadfile/image/2021/07/08/file/20210708_103039_138.pdf
    • http://cosmikkino.ru/sadm_files/48639803276.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/4j4mdflcab4a71kbrbeiimnamk/270907534.pdf
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/gudagedevibe.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/100cc3bd57ebe21fffa6b162ccb64e5b/78554486674.pdf
    • http://csc-0411.com/userfiles/file/20210720051126_oks81b.pdf
    • https://securityguardsupply.org/php/uploads/file/rafajobekabowuwemazuwabe.pdf
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/iu230vb2dqa0t9ado6ogfml1cc/81044984098.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=absolute+function+in+c
    • 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_off0000c116.bin
ed3c62a91520d22761255d462d6374e5c9cb1c3cdb93e13c0b541787e0c5c338
pdf-font-stream PDF embedded font (sfnt) at offset 0xC116 10288 bytes
font_01_sfnt_off0000d86e.bin
4ffaf3b9f0a63c03a2d68794af90cb773f3f55e08a61b3ff0725c85b17bb7f29
pdf-font-stream PDF embedded font (sfnt) at offset 0xD86E 16048 bytes
font_02_sfnt_off0001025d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1025D 16792 bytes