Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8c7328548e4239…

MALICIOUS

PDF

75.5 KB Created: 2021-08-09 14:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 15741824877c137c425d1e315b9e5dff SHA-1: 65c7730e72b4cdbe4619d210493152a8b4dd0dfd SHA-256: fd8c7328548e42398fe96af36c8043e0a46d955ae65ab2e393fe3ab8c4b4ae60
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised or disposable hosting domains. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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://serviceservice.eu/userfiles/file/wusuri.pdf In PDF document text
    • https://nutstudio.it/userfiles/file/9241954054.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/pupejagozagirapiga.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/danawilebolinawidato.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/putoredas.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1454dbd4e---25006843176.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/0k7u735srfc2u686ku1u11btv1/saxusonizojigokuwe.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/bozodumetodozug.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/59285368195.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/15714898606.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/34682189004.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/jukinev.pdfIn PDF document text
    • http://mebell-city.ru/ckfinder/userfiles/files/wuterorefuwifunexila.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087df4c58e9e---pomotebagazofolisot.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ce000018c---lizemi.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/i8pmshe5ngcj1rjesufla9a6q3/xivezevitupi.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/xixak.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/foxenuladegemuxurap.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/odgbak6s26sgqoelqpmatfvj43/wejoxeduvunonekibefano.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/59891068725.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/08bb4d77d97583243f6befa6e1d8db7a/nabajil.pdfIn PDF document text
    • http://51www.org/uploadfile/file/9a5bbf959e2eeff3b6e056b116744ec7.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/36181144026.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/pamoxaroxizivelopogezej.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/9a511d04b2e7af2c40140a4370913a7c/bekexotomixab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=adjective+and+adverb+worksheet+with+answers+pdfPDF 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_off0000c294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC294 11164 bytes
SHA-256: ac6cb09c8366955dd0c4daba6672c61fe8dd642149cc42412828331af2f4fdb5
font_01_sfnt_off0000dc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC73 16512 bytes
SHA-256: d5ecb7415f48bdcd608081bc672c02b3b293e516a3276ac678dc42f062f28a22
font_02_sfnt_off000107a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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