Malicious PDF — malware analysis report

Static analysis result for SHA-256 904fdeb7bba54991…

MALICIOUS

PDF

88.2 KB Created: 2021-08-08 23:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0f7e1086b113761cf6659c77d31286f6 SHA-1: 2a8083d68a40bc4fcae32c408e58cb0ec9103240 SHA-256: 904fdeb7bba549917b2f7e458ceb1f168d81a1926df8ad9dfe9e78afb03135b1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating attempts to leverage compromised infrastructure for distribution. No scripts were extracted, but the overall structure points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/0jl859fs2caq4ic2utuor8md6c/439177669.pdf In PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/p2esvtb5alm3k9q9ctr1klkck5/tupilapumozamiravufe.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/225fcb16fcd0070b0e26508082bc0d9b/70724091520.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/suwulisumofuvagibusulute.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/b278cb96a36a17d82cd9d229c393dc7c/vofunet.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/8c0a8ce79d20da4e280a012f3cb6cac6/jolegof.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/40124476585.pdfIn PDF document text
    • http://vasamo.org/pds/userfiles/files/25898421857.pdfIn PDF document text
    • http://everettsbarbque.com/clients/b/b0/b0b566c85bab127526a414587b81487f/File/xatuze.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/42956750721.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/disawezetobeda.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/kumatitarujavajigepidija.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/19354067561.pdfIn PDF document text
    • https://t2sc.me/userfiles/daboxifowujoxomed.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16072545ab05a7---47214954026.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/94507720768.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/99537068652.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/791c78aa30d4399a8be4f116da89decd/pisefilegakotiponof.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/65erspud6hkesvhfng2mqahbc6/50836271589.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/bb1e940351a08ca73e5580bcd0fd11f6/wepomudo.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e783736822994f6fc7266d7d471f9c77/jogilusota.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/23eec2a8c81af7d8be3fb4776a9868e9/nireparukoviva.pdfIn PDF document text
    • https://dintek.eu/uploads/file/91515959045.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c20c107beab---zemutem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=commonlit+pre+assessment+answer+keyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DD 10736 bytes
SHA-256: f440a2b0aa4a78c5f5394bd5003526b3875e7dcabc28b656f02dc0127400ce93
font_01_sfnt_off00010c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AC 17480 bytes
SHA-256: 83ac80a6952f58fc85b798b9cf27ba1f525bff7235a0f7c156175a306d3d4aa2

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