Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5ec48c7a5d799b…

MALICIOUS

PDF

79.1 KB Created: 2021-09-07 14:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cf48df41d133b5d25b4c6f387711786a SHA-1: c29ee83558d058285fbdce7ab62b2c0797ab547e SHA-256: ff5ec48c7a5d799ba1750e1e94a6ef2b2cae34c2caa991cc3c38a0ec69df2ba2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to host or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://felixefontesadvogados.com.br/ckfinder/userfiles/files/36136260166.pdf In PDF document text
    • http://dobrejaja.com/Upload/file/80465259790.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/35358067728.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/21060659096.pdfIn PDF document text
    • https://tempegaring.com/contents/files/70015743151.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/pasoritokilanutakasuno.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c8999f78ea8---915301883.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160805ac91d981---jemuvemowowalewopemumozer.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/sovorowigoripo.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/85576715011.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0d64d26ae---sokusanegori.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/57714702852.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ac23dfcb6---70034290845.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/128ffc8ab77d696457f6d94de0bd7043/72080649446.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a304fcdd142---95102345947.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f6654155fb2---74290556809.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/tisominubu.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/831675110.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/cau05pgdd4t0p5uehqk03bsu24/jekijunibeziworamuki.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/pimofokazakopowetokug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=nda+1+2019+question+paper+pdf+downloadPDF 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_off0000ce25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE637 17896 bytes
SHA-256: 996c40dc4b75189e97c05b0b4332096a5a6f8d1f3c14bc447a89be6f50a366bb
font_02_sfnt_off000114ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AB 11264 bytes
SHA-256: fa8c7618d527a41627136861d40bf82a4fc8df273adbbeed7b3c0815bf347d30