Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbdbb47b7cfa9ac4…

MALICIOUS

PDF

88.5 KB Created: 2021-06-26 23:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f55d29bbef3606183783119f65aa5acb SHA-1: 708bace6e6b4ca9eeb62ecbf52a15ca318569c5f SHA-256: fbdbb47b7cfa9ac42201f7815431f7c03ecfc3949d2f700feee5193d191973e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b02cd6151d---nokusizefaret.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/01djhbb0k8vi0npvtp4u063qn1/bufumebu.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/2lq2s98djlolakqhb4gfs6a6mh/59051399293.pdf
    • http://skyline1968.com/clients/74864/File/xixunojevomidak.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c221247a718---6156679321.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/dk4bddu3jkg83iibajm8mi7da1/32102004313.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078a0b88913c---kisajatawawe.pdf
    • https://cortopolis.ar/userfiles/file/jibarazujewa.pdf
    • https://superpart.com/files/46704743310.pdf
    • https://dailyiat.com/html_upload/file/konevijinafevelazube.pdf
    • http://bioscipublisher.com/files/upfiles/file/fevepitefetatu.pdf
    • http://msamerica.net/clients/873634/File/34975156467.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734efc976b3---25079494493.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e35d36e15a---26414425664.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098d4b9d3ce5---pexixex.pdf
    • https://songhong.info/userfiles/file/kigopaxadivu.pdf
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/3054198671.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/c9k5omur0fle6t5in40eonekt4/dubukomuzazelurulekiri.pdf
    • https://pypconsultores.mx/userfiles/file/11374108725.pdf
    • http://sva-jeanroze.com/xmedia/file/temujarojafo.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db1ef2b0a7---26193184131.pdf
    • http://project-lovcen.me/userfiles/file/22077902204.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/7f55a0f3deefdcfe44faa794905becf8/xezajuxalopakoboge.pdf
    • https://aldurra.ly/images-editeur/img/file/28655587394.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad02591895---nemuluvikipunugi.pdf
    • http://farmaciacogliate.it/userfiles/files/38492124190.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=what+kind+of+person+are+you+interview+answer
    • 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_off0000f718.bin
b1417ed4cbe3c977651457353ce1774d30975d122e4bf9f2ff3cdf66b6887e7b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF718 16332 bytes
font_01_sfnt_off00012102.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12102 16792 bytes
font_02_sfnt_off00013919.bin
33ea716b95fa9cb68880e81769a9ba40c74c6e3cff0664f478f706d47d9e251f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13919 11000 bytes