Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdadc38817d3b315…

MALICIOUS

PDF

84.1 KB Created: 2021-09-17 19:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8b8e9695154e3f89613d2e9d2c7df91c SHA-1: 0812c9e53f0de94ee9bcb566a60e4783c37db314 SHA-256: cdadc38817d3b31562e571ee8d76b0368bd1e9f5d6a502d4c85e5686439fd791
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that function as a link farm, directing users to potentially malicious websites. Several heuristics indicate that these links point to compromised CMS uploads or disposable hosting, suggesting an intent to distribute phishing content or malware. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://inwebjor.ru/uplcv?utm_term=what+are+the+best+widgets+for+android PDF link annotation
    • https://fuze-pay.com/ckfinder/userfiles/files/82102499760.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/4238136385.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f95a25b461---kudonisolitaluzamid.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/lamudexunewujetikug.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/23638376659.pdfIn PDF document text
    • https://maria-galland.ru/files/file/4746567401.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/91118895705.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c1e2ace32---pevidozis.pdfIn PDF document text
    • http://vecsecity.info/editor_up/motaka.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/40832074112.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/73900053080.pdfIn PDF document text
    • https://businesslife.com/content/files/2268261355.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/74661877416.pdfIn PDF document text
    • http://gro-felix.si/uploads/88488635164.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/nikadim.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/jovagasoloxesitagore.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161377381031bf---zizalopixepifepan.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161350c77a0163---mivuwe.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/13635015722.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/wojili.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/66649324642.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/74624589108.pdfIn PDF document text
    • 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_off0000e4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E4 10804 bytes
SHA-256: 58ae1f523b6f5c41cfc39e8d9c8af6910cee37f1e20b78af5dcd21fe8b1e2492
font_01_sfnt_off0000fd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD99 17412 bytes
SHA-256: 810542b88036ebf2d1aa60fd2d698f2ef5ed1619679287f5a01512490d78ea8c
font_02_sfnt_off00012a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1