Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d47175ff24cc989…

MALICIOUS

PDF

99.5 KB Created: 2021-08-06 17:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6529fab0d02d4e90231e421b48614ddb SHA-1: 86a4d315732b23bd6a4b307bb3561cd0bc09685c SHA-256: 3d47175ff24cc9895e90fd1cf17d3c7988a1a969f6529f42a82b798342de5bb0
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs hosted on potentially disposable domains and compromised CMS uploads, indicating a phishing or malware distribution attempt. The document body is unreadable, but the heuristic firings strongly suggest the intent is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kermoulin.com/userfiles/file/71037980648.pdf In PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/2aa4ad24fed6e198d91f15c50acf306f/50143533876.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/rsifd721g1q1kc5gbe0nnfd2j8/pikozowuvatimaxomuvibe.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4fc1d0c9b---baxejizenoxiwi.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/jawizesatizapef.pdfIn PDF document text
    • http://godswaynehemiahmbc.com/clients/878002/File/bemarimonaziximake.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/10690326310.pdfIn PDF document text
    • http://eternoohydro.com/d/files/vuxozixanibotozuwo.pdfIn PDF document text
    • http://miamiokclassof65.com/clients/d/db/dbefc63a503cf3d3a4f9fb61678ecc08/File/gipavusisubivabexegujan.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf29f0cf5fd---gulowulalubu.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/19702517331.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/85295825821.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/88669861091.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071298656940---95770701590.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/18232885625.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ac80a1d65---tujakutipa.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/of0014ilor411fh9g4htn85d8k/4437647709.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/58a61c6fcbc8b2834c05d453afb3183d/kukorubiw.pdfIn PDF document text
    • http://asfcursillo.com/clients/879797/File/26146561914.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/zudofirasew.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/5367987444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=partes+de+un+molino+de+maiz+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000120bf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x120BF 25864 bytes
SHA-256: 8a456e65dba960421a555c6053ac4af2d86b8b8688c65625d064482a928c71b7
font_00_sfnt_off0000edb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB1 19872 bytes
SHA-256: c823efbdd33952ced7f26eddd8870c7504ca26e3ecc69253bf6953e503632939
font_02_sfnt_off00014e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E45 10572 bytes
SHA-256: 7ad90fd731d6f3c5e8500f6fb271fe41031946cc961fe77ac395bddc1716fe48
font_03_sfnt_off0001666a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1666A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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