Malicious PDF — malware analysis report

Static analysis result for SHA-256 93755a8f32ca3a16…

MALICIOUS

PDF

84.0 KB Created: 2021-09-08 05:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4dd8cf1ff0ca7329a82f01e6088aeec0 SHA-1: 6992a6360404fc62e525dbb67806c0d50446e57f SHA-256: 93755a8f32ca3a169a433cb0185e682007408360dcc8ac9b893f311942d9b52d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=social+anxiety+scale+pdf PDF link annotation
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b760efbdf8f---buvokakoruzidiv.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/zuzebe.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160988277e146e---mokekuvesunagisutavisi.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c8eeec2d1e4---92116025375.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/3dikj6shiaj29abscga2sqvppv/gutinamuwasujogevibejoluf.pdfIn PDF document text
    • http://specimport.by/files/files/nonejolazufoxafuwuvameza.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df12a7ede87---fetesiduforokoje.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/89304204439.pdfIn PDF document text
    • https://loctra.net/userfiles/file/37601187088.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/99665578919.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/90588738474.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/6bd8d64b0b8141163029a897f118073e/65351943916.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160818107e2af8---67279192588.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160989438e7ee7---repijalekopowirexev.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/tirawemisunupinajorunofa.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/14992201749.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/5904269788.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/riwuloxedovizonigegi.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cf09a003750---41757339102.pdfIn PDF document text
    • https://codecs.ro/images/file/bedixekeso.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b13f834b24---melajeburo.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607907d20a5f0---lumowala.pdfIn PDF document text
    • https://hoavily.com/uploads/files/61805694840.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_off0000df8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79F 19120 bytes
SHA-256: 8624ee9499c829bd97db4d3bdecb210754fbeae7a48411b6a9aeb7620274778f
font_02_sfnt_off0001294d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294D 10804 bytes
SHA-256: 105097815a772f2186c0920631448e94e41dee45850bf8c53c14a77541bcb2f3

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