Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf87bbfe97add6f…

MALICIOUS

PDF

85.1 KB Created: 2021-08-01 21:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4d63e4b2c8238e826d258796b2d7f7ae SHA-1: f9847eca4678f9dea9a3cc2f360df296b7d3c362 SHA-256: 5bf87bbfe97add6f46ef6076d815d45094f8c70305b0ac55aadd1f975352103d
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to domains flagged as compromised or disposable. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed as a link farm. The primary purpose appears to be directing users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://ecoretras.com/file/57823278082.pdf In PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/d8926fe24b246dfb7ef8cbd0509f9650/detif.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/pigudefevin.pdfIn PDF document text
    • http://alvitraders.com/files/32518783630.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c57ca4eae5a---wamadugategolidoxulul.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadbb1dbc91---92562946531.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/34790263578.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/61169971161.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/18408122028.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/bijapedijixeber.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c7ab2813d---xibavukokomesegonoj.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/20147250483.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a06fedd6a5---nojojas.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/xilebibopaboludulepivi.pdfIn PDF document text
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/84113120164.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b733923f---57637618154.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c96368c0541---zulokuzagenijori.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9db7a27a3---jotadoma.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/67dfdc3651e3190398ec9f8243a3dff0/karevomo.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160ac287533e0c---meson.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08c95d620b---nejikezerelukepuxikedone.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/ft2b9vk7rt614tk2hhpqt4a9m7/27743346412.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160815d12d6510---37582853020.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/b61928c435259f021a5546361d9c7ade/zetomanasatinaze.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/didiv.pdfIn PDF document text
    • http://hms31.ru/img/file/19180683618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+disable+car+alarm+on+2010+hyundai+elantraPDF 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_off0000e3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A7 17188 bytes
SHA-256: 23853b7dac6eb9bdf477f93bf2f6f847138957c03947fb2999feaf6ffc565727
font_01_sfnt_off0001109a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B1 11360 bytes
SHA-256: 1a1e2ed184f71c2a03f283fa0164e4041e74fb29d49a70a71355916e0e1fb887

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