Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee2b2446f7526455…

MALICIOUS

PDF

75.1 KB Created: 2021-09-01 23:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9766b4701821667dd8ae4e84e9f0701b SHA-1: 4aee0eb398243cfecdee92e26f94db2e2dc5b652 SHA-256: ee2b2446f75264552c681fc76e5b7f723a2d62124789ddcf0cd9e56582dfc84e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple potentially compromised websites hosted on various domains, including a WordPress upload directory. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, suggesting an attempt to obscure the true malicious destination. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608879cac6eb5---mimitotexebazelikuse.pdf In PDF document text
    • http://www.andreapondika.cz/file/matofo.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d34dac563e8---23358821608.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607997203d341---1062925400.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/tumibagofowepasufaw.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/72458812031.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/39192722566.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/35c2e02a10fa46d48fd125c9be1a8e93/jinosiridixodew.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a24221eb4---nugamafugebideburuso.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/42451048759.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/suwasik.pdfIn PDF document text
    • https://hgb.se/filer/file/15739883910.pdfIn PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/24235866058.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/cpm43bj7uq80l5090hfiaksvjg/vebuzajebutepuremosivode.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/44010149874.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/1b93da5965afda0631ac277cb88cfa5d/rejoledopevilavivederiju.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/nebalowozunowiligenojinez.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/fd071e4fd053eddc525d3a3536d1ccc6/69519418817.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///perapipawumalonubiteb.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/38030550083.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/gebiwevedudaxezawal.pdfIn PDF document text
    • http://dakov.hu/_user/file/kujakurexamevila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=happy+birthday+to+you+ji+song+download+mp3+pagalworldPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/64fb5c3be028d9a8090a319d321760ad/nalebofigolamab.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_off0000b9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DA 19320 bytes
SHA-256: 8b3ffa02d78a8c4cc33bc4db748071483ee73f2099e5c9ed3067d251e590eab9
font_02_sfnt_off00010416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10416 11440 bytes
SHA-256: 1aea4ac567a16d50c9aea2359dfe8fa8f1208d0f67767bae87bb8017b73d499c

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