Malicious PDF — malware analysis report

Static analysis result for SHA-256 724ffaa1d5494986…

MALICIOUS

PDF

73.6 KB Created: 2021-09-02 13:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 673bf012fb29690650f1f87cc44a926a SHA-1: 32a089c625a6dc57037c54bb9f82c4cdd8fc339b SHA-256: 724ffaa1d5494986c1bf89511d448c9f1d974bbf670d69bd8bd12f2c399bc738
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and embedded URLs point towards a phishing or downloader attack pattern, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/5ed25756570fa39874c22dc44a4d22b7/letalokinemivavejudejuw.pdf In PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ecf9d55c3---nisifotetekipapof.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/kirarusobifirogisur.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/301456b483843b4eded1c428f1241af8/suduxofiri.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/8d6a225c66094125a6ccc02d934391b9/rulonemizewovide.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d6b122eab---noroxizikug.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/jozinufejuvonoten.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///vadesuxu.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/5591053c3f60360ca572ebf40c30bd2e/dofagidezabeda.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/ffnvpsrnm5853ljqtqri0ettnq/desatotosaverizipade.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/pafosakijewoliwid.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/vugurudikedugokimubipi.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/relekijuguwetavag.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadc1b8d38---lawumudijeniv.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/61593107597.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16081e5c508d61---99875824322.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45905089340.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/viwaxupekipokewegarokelol.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202108171911411217.pdfIn PDF document text
    • https://landi-bg.com/images/file/gipixomunajesusok.pdfIn PDF document text
    • https://fultoys.com/userfiles/rotijativas.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/fukar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pdpa+thailand+english+pdfPDF 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_off0000c026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC026 10556 bytes
SHA-256: 79556fc6bcb146c72bf284f1c2ecfabadb710be669129f87af125c6309ad5335
font_01_sfnt_off0000d7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E5 15916 bytes
SHA-256: 967bc862cd22601da941a59a5d59a5e231d56388a1e6f70a743ea67837267e79
font_02_sfnt_off0001008b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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