Malicious PDF — malware analysis report

Static analysis result for SHA-256 710e9cecb9ba428b…

MALICIOUS

PDF

90.0 KB Created: 2021-08-11 06:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2c52fa702f62f0c48b45443652744d49 SHA-1: a31b5dad9c654e95ad96e9dbb495b7f33bfaa64d SHA-256: 710e9cecb9ba428b193abdbf8f05e3446916fb1ced4f6b622d5bb2a2bf8aa376
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS upload directories. The ML classifier also flagged this PDF as malicious with high confidence. The presence of numerous links on disposable hosting and compromised sites suggests a link farm designed to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/7898096b0337075e80c75354ce2e3dd7/67231034122.pdf In PDF document text
    • http://resetimpianti.it/reset/public/file/vapunuput.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/jugoxerodezanobulid.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/26074932241.pdfIn PDF document text
    • http://snft.ro/media/file/lotekafelawanoneri.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/vufobojinativedip.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/zifanon.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/misowedavi.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdc7eb0985---furop.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/11537240643.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/5661634685.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/20804570718.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/3090154649.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/bhtqntjk3sfpca9nd8ufv0mh3j/sowatuganano.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/27035533070.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160afc1e2bae80---wumaruxi.pdfIn PDF document text
    • http://industrialdevices.in/uploads/rufolud.pdfIn PDF document text
    • http://grandbarnettfamily.com/clients/a/a0/a01b80d98e57c38af56892ab55e7d82f/File/50800611347.pdfIn PDF document text
    • http://orsolyajuhasz.com/ckfinder/userfiles/files/71122607144.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/2642a6290021453bf63c9d9855b61602/11873193160.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/073118c28e33ae5bfa076a64e015f6e5/zeruko.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210621204715_i7yzf5.pdfIn PDF document text
    • http://tulsacentral1963.com/clients/3/39/398188050227c7f1c8b3045a0a865105/File/72070982796.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/64197497315.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/itj0v7gtho49uerifude854r7u/visutukujipakapugogewobuj.pdfIn PDF document text
    • https://ancoraeducacion.com/images/42025130610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=google+play+store+game+download+karne+wala+appPDF 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_off0000fb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 16892 bytes
SHA-256: 3f4dc5c503bd5f029f1a3e8c3b74a86f89b071604a8a59ea723dc87e64249a25
font_01_sfnt_off00012709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12709 10976 bytes
SHA-256: 98c14ded8b20a5ca985020cc5cb164851cf4ef6395421abd8e8856afd45d8500
font_02_sfnt_off00014080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1