Malicious PDF — malware analysis report

Static analysis result for SHA-256 09ef0b6f48e048a0…

MALICIOUS

PDF

91.6 KB Created: 2021-07-21 10:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6c10da21ae57037fd53ac5543bcae8c2 SHA-1: 1699692d088bd152664957fc94c96b9e1ed5ac39 SHA-256: 09ef0b6f48e048a08d0ea08291d85e18c6097915da784ba2558b2027d0371ca7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/a0c2e48741cd3f06f793db4621ff69b2/16452670126.pdf In PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/tilagot.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/gumexe.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/b4m0bhqsrquetr037pa5c8eahi/samofesafi.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/9520445315.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cd822ac29de---bivamasibadanitu.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea2fe9ec22---44694314900.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/kubozoxubepoximopukixija.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/wepevoraxobuvemose.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3509b7c244---siwatetofonokivodoka.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/8c07face582260c03d44814598539693/tujelanujeratemanadepiwob.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/b5e89cda7f83656658247786bf418cae/40364960439.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/rii964q8up7dtncu619fn0p0ie/85333253306.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606c7be2886fb---67614918254.pdfIn PDF document text
    • http://vo23.ru/upload/file/9927126137.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/xupudejo.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/vesudu.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5584a5cf3dbbe92a484f0e067aa3c65f/kipiw.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/nizatez.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/63885660242.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/fabag.pdfIn PDF document text
    • https://lesura.net/userfiles/file/49055071108.pdfIn PDF document text
    • https://lamthong-marchph.com/piceditor/file/pugazurodaloxipelajize.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b21b795a5f---60695521266.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/52347298516.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/2ec45c7e0eafeaf23b61cb80ec1e890a/8970454896.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dd85a45e0---musezogetot.pdfIn PDF document text
    • http://safarang.com/basefile/files/54785302424.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=force+and+laws+of+motion+class+9+worksheet+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_off00010043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10043 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11855 17408 bytes
SHA-256: 0af449b01eaebe5d2c5be666abeec7a0a063d25af331cfa9bd3a77b24694947e
font_02_sfnt_off00014666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14666 11208 bytes
SHA-256: bd237473db353a1bf0fe63070f80705c37f6bb6fdcf89a1242ad4e094b816a17