Malicious PDF — malware analysis report

Static analysis result for SHA-256 08afe9e37d4804a1…

MALICIOUS

PDF

87.7 KB Created: 2021-07-30 16:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5b4ea589b436bdc7f53084912c73c7c2 SHA-1: 9c0f7d9568c080c6f450105d4bfed2bc6e7a1faf SHA-256: 08afe9e37d4804a1f41ea8733a8d6f28d7da6e1f6fe73708ef3e7770ca1dd9d7
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier strongly indicated maliciousness, and the link farm behavior suggests an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://food-cloud.com/home/food-cloud/www/site//site/data/files/zepologugotevozovefibof.pdf In PDF document text
    • https://hirurgija.me//files/memuwumejakuz.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/43818919715.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/zutejesawofijilibefedewuj.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0e49d9e1e---21572154322.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/fujotusenudux.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/ifbqajtr8ks7g46gevuem2djac/42336981417.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/zoderolulalujago.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/8ffephclf5huh05emin9s8tgt3/dafabazozonojaxelegafakos.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fff5dbc2cf---68251783831.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dbac9b6536a---30646749874.pdfIn PDF document text
    • https://flyags.com/editorResources/file///69136560185.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/skggspkubb03bdq8f545lrq811/87507921330.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/c80ce43be0235feadb0719a50cea9ae2/zibokotusosozab.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/45069720095.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a7031f869a4---xekotepotoropotinamo.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/47362646654.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47e8c3cea3---zexijiwupojomobaxeru.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/lunixasodatenamitijida.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/sulubiregutajugixiwaped.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/vavubenoxevaxivijul.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/70824585698.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ba524d753c1---17238671409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=download+kinemaster+pro+mod+apk+v4.12.1+for+pcPDF 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_off0000f033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001084a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084A 11344 bytes
SHA-256: 7e868ca50d513ea1fb21df7a255f3d67ef35d82349cd24937a52a218d5de78ec
font_02_sfnt_off00012326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12326 17056 bytes
SHA-256: 5943852c7f269bd23e04053964f459666d9b48ad8337136de14f189d57d4d5e8

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