Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3ef03b7a8b92f7…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 11:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 41026772945e6f549077f9ab04cc64ab SHA-1: d3809699024abe1936d49549b4776c4a7f4c1512 SHA-256: cd3ef03b7a8b92f7d186dacf4f0d5c2df5a2ad3ed70670325682875d164c4d6b
104 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a visual download button further supports a lure-based attack pattern. The ML classifier strongly indicated maliciousness, aligning with the heuristic findings of compromised CMS uploads and link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=fate+grand+order+movie+download PDF link annotation
    • http://sirinthepgroup.com/userfiles/file/89235670567.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/89830021588.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/81160302647.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a872967931---mevofuviwujadev.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/75797701384.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/da518f78c6dddbc3864687bbd2f219e9/98990289733.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/dejevosovedukavu.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2151fcdc8430579d53cc2d32d594e345/budiwir.pdfIn PDF document text
    • https://motoralbini.it/files/file/1409315957.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/masoxelupawupizep.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/vubenusarebex.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/guwavebu.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4d79798a7---pujabipotitewasuketilipi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613804f937c36---12152951738.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/podot.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/98688303998.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/33021055016.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/momofadujovifezesunoro.pdfIn PDF document text
    • http://benly-carson.com/product/files/zovukazemisukegof.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/woseterituwukiruxisi.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/17539157553.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/tawezejakopotipulopuxexa.pdfIn PDF document text
    • http://drtamerturan.com/file/68717755071.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/42038426017.pdfIn PDF document text
    • https://maximaainfoways.com/WebExams/ckfinder/userfiles/images/files/1157937062.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/ruzeramafulirikuxegivowul.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/nixipewenepaxujupemenoge.pdfIn PDF document text
    • 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_off0000e34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34F 17256 bytes
SHA-256: a1481fbc45210fabd22a9e22b12cea1b224041b227bcac4a6dfd10f1247c1eb0
font_01_sfnt_off00011010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11010 10552 bytes
SHA-256: af8e6130fd70927868ba9552c806fa68976247fd04fd6ebf0833b9f7f0cce7a5
font_02_sfnt_off000127ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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