Malicious PDF — malware analysis report

Static analysis result for SHA-256 38fcc3af89b0edf6…

MALICIOUS

PDF

86.3 KB Created: 2021-09-05 17:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 02405d3ef8f9a3543a9a8fb8f5931795 SHA-1: 5af126bd94133faf73e6e5e79147d2348b3a7e01 SHA-256: 38fcc3af89b0edf628e53529536e00b417c84e1cbd1f89d1f97d05da5bfbab5c
156 Risk Score

Malware Insights

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

The file is a PDF containing a link farm pointing to numerous domains, many of which are associated with compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and link farm structure suggest the primary goal is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://archism.ru/uplcv?utm_term=number+40+tracing+worksheet PDF link annotation
    • http://cablexconsulting.com/Upload/file/80016938248.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16074425e0c1b8---zolelinosiz.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/36308305332.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/sasepuva.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4985d3ad4c---20249696849.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ca4a84a0eaba048f38842fc40bc26145/tomilowizupafisiwejedakak.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/35915134850.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/8e074a3f02ec6f94efb1ed13d573be7a/meduduzegeporedorur.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210809113103_ns7gpo.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/kelijaxab.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfec9051ebe---rubolusebuzijetibejejib.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/49015170667.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaa3108068---melirodid.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/11026129162.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/fobiraxidav.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/8385467388.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/cd89b38f0f53bce0096a4447c60054b1/488110385.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/zobabufolul.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/c26917a3edc342127e574a9a190aae21/12648078107.pdfIn PDF document text
    • http://clipsttm.com/userfiles/file///39763239963.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f1d97435559---tonudenulejutanaragerenim.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/eacc7445e3ec1afe52608bfbf771d838/xivola.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_off0000ead3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD3 11224 bytes
SHA-256: 4995f93539e2e1a6a939c81422e8a32a10119884123730bf28e4fe761d7fda8a
font_01_sfnt_off0001050d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050D 18100 bytes
SHA-256: dc8d935e79127231540dd66e3351f4b4e1f3043ccb68e3b5691c3febcce31b9e
font_02_sfnt_off00013395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13395 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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