Malicious PDF — malware analysis report

Static analysis result for SHA-256 02b94086eea85667…

MALICIOUS

PDF

88.8 KB Created: 2021-07-30 20:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ec8a03d2434d7ff0b7f551bc586730ca SHA-1: 72bc49c015108592ba47ce10cf1bac6ceb5760c5 SHA-256: 02b94086eea85667be03ffb8e1f0a9bb5da5149e2aad6256c5dd85eb3095d42a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress upload directories or disposable hosting. This suggests the primary purpose is to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.insight-assessment.com/ckfinder/userfiles/files/loxadigokelakudoritemunot.pdf In PDF document text
    • http://shinies.ru/img/lib/file/19521819165.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beba02ec1ae---tuxoduxuwugimevofikamuvu.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c97453056de---bomisakod.pdfIn PDF document text
    • http://allasclub.com/campannas/file/sifegikowereliwagutibino.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/98144696330.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/943c4432f0569a809422f40d41bfd61c/zugovanodov.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/9af5a07c0a3d0f66070753471b45f1ec/pozefuxi.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/sudobusuwufafajizuni.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/8b5a9f82cfe50e0ef616066fd52843fa/wigobixopajamutep.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7f6536cab---89993672223.pdfIn PDF document text
    • http://vieclamquantri.net/upload/files/76814340741.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/6923267485.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/99dc94a7485a38d3d673eb935dc16f0c/88395092594.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9c16a3a0c---jefuxexubozokepalabate.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/rajuserofi.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16074d202ed647---48237521918.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/20807508649.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/bovurefas.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/fvq0vg7421r6c2l4cgd3dd4it4/16794193321.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3449f8ec12---35848288926.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ieg9bolu1kusvu74tshgms42ha/59206931698.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/h3kpkmemra87r17qk2v9a2n508/1366934507.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/zebejusuzuwofumidofe.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/bb35ff5eb03275352195a507748eaea8/zuwiginalejoxazofaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+write+a+literary+essay+grade+12PDF 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_off0000f84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84A 10680 bytes
SHA-256: 5dc1cf3aa7ae1443b92ad23339da5d932a1f91b38f445b1fc87c2eb82f0cf471
font_01_sfnt_off000110d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EB 17264 bytes
SHA-256: 38fffccb2da2149966d2b5448127a060ac08341b67b1e6ada03cac9dd553a758