Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b99ab49af6b66b…

MALICIOUS

PDF

84.4 KB Created: 2021-07-06 05:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4257a184fc5625191c71f47d5582135c SHA-1: 11bc9db17cc6659425ec790d9f5ee9f9e303c2ae SHA-256: f0b99ab49af6b66bc330d5019e0d9f7d341df390d5c6749b19096b75b6f44909
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the primary attack vector is the embedded link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://sevimticaret.net/userfiles/file/nikazaned.pdf In PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/wosubopuvit.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9d2987e53---56283030768.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dbff3405169---51131465635.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/noripusenudat.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/nofopamopizatiguravatuba.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0045b9c85e---jevigi.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f596885e5c---45556436749.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/14837000581.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfcfd3d34b---42276117827.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/sidoliwe.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/gunibepav.pdfIn PDF document text
    • https://medtek.vn/storage/file/68992220122.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/124f5c944883148e3aa8780026d59a4f/92947123534.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/f84ci8gpm96onfcimc0ji3cmas/69956324020.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/c1e17a0070c0f9b2b0af1308e42d4a99/67690844074.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb4cac923f---2843324282.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607525f252930---50435002629.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/6ac50415a4b24193896328f7ede9e41a/90409541879.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/tuxekuwelo.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/62834435813.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202106/file/1622952485.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0d5d0e4155c41f8e8f91470151801706/dipokamuralilipesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=arm+tremors+causesPDF link annotation
    • https://medlineplus.gov/tremor.htmlIn 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_off0000ea71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA71 17072 bytes
SHA-256: ad77572ff677babf6119800016be5a4947b709a758a0405452932179df868852
font_01_sfnt_off000115b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC8 10232 bytes
SHA-256: c8bd0d6807ef8502f6b7f7872f0e426c886a17d3a9e2d12306839905d87a74d4

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