Malicious PDF — malware analysis report

Static analysis result for SHA-256 37877d3573afbf35…

MALICIOUS

PDF

97.2 KB Created: 2021-08-04 00:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7dc054f402fa447716c64b45cfdd4081 SHA-1: c19d24fe1a410e441c3b188fae85ad94ce5b9226 SHA-256: 37877d3573afbf35b50115cc9624d6f0c84ec17d3e88b706f088c382c73889d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://brukbet.com/user_images/file/72413780359.pdf In PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca22358505---tunanowosegefip.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/59396724619.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/bf1926c73cc9608812c5560f61800cf5/rekirunozod.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/dibisetabafusu.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adaed655ece---xejixaxutox.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/jimawulinizojevaleza.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/nilupusubawafesobipi.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/64383829054.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/2bf4b0d033df021181cfc3b72b06e640/tesurex.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/h53cfrk3cl6gch8gve41rr3ktk/18839329988.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16105370368c6f---60934355800.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents//files/soforetepavopuzifalug.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/aui129alhk6qinuc0m6triodfs/tifawur.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/disavakipegijuf.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/17864977083.pdfIn PDF document text
    • https://triosms.com/userfiles/file/36931225642.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/fa5b37dae03f5048a32ae1b6104e3634/24421525892.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/4897917106.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f068f189a86---78437763654.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/58299152541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+answer+conflict+of+interest+question+in+an+interviewPDF 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_off000115b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B3 17932 bytes
SHA-256: 85e4fc29b70447aa50b2908480d51a07461b8733de555d0b45b10fd5b7722383
font_01_sfnt_off0001448a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1448A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CA1 10720 bytes
SHA-256: b0283bbb420c7692851f50d36dd0051de8db018c67ccc2bb2b61e9e5261248bd

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