Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3fc50f9f3b90f3…

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 16:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a130ddfb7318f7c84a0b30f4f5f45c4a SHA-1: 5f8f8a7868bc138e82d6daeb4d923d3d8afff5b8 SHA-256: 6b3fc50f9f3b90f371cdfe8e9b74e79b7cf45f3fc08698e8c8984ee19900af1f
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains. This behavior is indicative of a link farm designed to redirect users to malicious content, likely phishing pages or malware download sites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=experimental+method+of+educational+psychology+pdf PDF link annotation
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/7e3087e9f56c30bae900485a14cb2c7c/49936000506.pdfIn PDF document text
    • http://4bx.pl/public/file/51633156018.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4217c24e5---88469146120.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/pupinuxamegogotegofe.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/1fd87e13082bb1590c116cab3c5311bc/galonemumixarowigixugobu.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/892e91a6e508e180730f974503944769/mitiletelexebofe.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/korufumaziwerel.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/59bf290e91e4ec3dacb98c458d075cfc/jobimidowazelurebubekeror.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/75c413307e54c1a4b7baa5e2d60f7a15/68972024936.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/jowipadunako.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/lafimolaka.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/35525439304.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210831_618236A8A5F134BB.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/9246e723df473f0705aeba83add4c2d0/17490330177.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/82924961201.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160eca0432cf6f---59426212097.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/56497571922.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/60058359499.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/12108934705.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/38433312547.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/vidmum8c4pg8qihqbk0mu7dgph/laxuzitopafoladajagi.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/58f3c9045921cc13bd3298d4462e7b67/titedotaxidis.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd9cf878a6---2150185160.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/20018229976.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021072118422759.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_off0000dd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD09 11368 bytes
SHA-256: 0821d016afb18c72499a5345d41c7a56fce5f1b2c7f763f8b64e452d8e864198
font_01_sfnt_off0000f76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7E 17536 bytes
SHA-256: 09a136008a9fdfc387cbf3f5ec34407f3db979c13c67c831c43f82b3bf88f3c6

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