Malicious PDF — malware analysis report

Static analysis result for SHA-256 55395fdc2c197fd9…

MALICIOUS

PDF

105.4 KB Created: 2021-06-14 02:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: bd4d6ecd55f91d2068867881aace7205 SHA-1: 4f5c6cd0801d65ccb0602d787d3a60e55468c550 SHA-256: 55395fdc2c197fd90a84e16d4a189a0014781507949068e47860cb4ab541c2b4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to compromised websites, suggesting it is part of a link farm designed to distribute malware or conduct phishing. The presence of 'utm_term' parameters in some URLs indicates an attempt to mimic search engine results, potentially luring victims with search queries like 'Inuyasha english episodes'. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7468

Heuristics 5

  • 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
  • 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=inuyasha+english+episodes PDF link annotation
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/c5e4e38806d3103c4cbaee8d6ebdc1ed/98840304548.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a442d6b3676---kodewoxowapov.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/70731725576.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f2fc5cbf8---sitazinugoruluv.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/98675733849.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb2e3e11ef---vofupexexodopozula.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5d48a2517---wabudizodejidasokon.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/e2b44cb9fbf5a478727d24d838d18cb3/xewakawunojonijarijunok.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b18eb57f77f---24511185237.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d49dc6822---juzitovir.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b7a2c7794---33877302455.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/72516041357.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/7d38b63621bc4c2b8cfb3e6531a01dbf/rerafepe.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb05b6d1dc7---49038693432.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/ip6cj5jgap5lf71scp4agrfimf/61480077215.pdfIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0001798f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1798F 14330 bytes
SHA-256: 2a4b0f6f5f5cb610430292f4515b138ff0c11f9a0409602795b2602e3d48a0ed

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