Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4dcfab9a01817a…

MALICIOUS

PDF

87.3 KB Created: 2021-09-07 18:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1317cfffc171098c38ce0e7f3fd572f8 SHA-1: 4f3bebd0ac25b3a40c9fd07007d22f9b3da4b5c8 SHA-256: 4f4dcfab9a01817ac178f5672d7be74754fb147d1813b992c10408031dabfefa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • 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 http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/f3ddc7104ed86ca4c4cde64b6d4a495f/95476596156.pdf In PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cb05b08ee---vuzobixosow.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1d3bce94c---fikisemujovusulevorowir.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/76917852035.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/c5552e198e9293054a61443f6c7f97ea/18020365090.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367e0f0b3fe---75514994387.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210903101829.pdfIn PDF document text
    • https://digireg.pl/upload/54261126823.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc4f9884376---wavexef.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/13072450519.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/51aeeea15acb82d4493ec9fb67a0a4d6/xareko.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/b7aa33aeabe198888cff4e26d1ffbadf/3069723459.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c870d7e782---21379126374.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/fc415861538e8e0d2638b93e64337398/rinunijufab.pdfIn PDF document text
    • http://htygroup.com/upload/files/vuwagu.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/75331480787.pdfIn PDF document text
    • https://soft-print.pl/app/webroot/media/files/zobilosis.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/8e664bd3c7eff34184b68cb34138d9e6/35458615575.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe2c4d2c6a---88619186392.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608a497a35e4f---69824809857.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/95d92d8e37573e3704036e32cef2f04f/52357323039.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/7uc783vg32lu10stbq9d1ctkie/62697840738.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ji6bepd70bv6m82q9ibpt8s133/kebapofilipajolatab.pdfIn PDF document text
    • http://nuestrasenoranm.org/clients/8/88/88a18899c67a61641ca1f7d027daa919/File/tijutan.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/22972458616.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/forukup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=resize+ukuran+pdf+dengan+nitroPDF 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_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 17716 bytes
SHA-256: de371a7ea886f95e86deebb3160d2a608d1d0e9f9d16f5179422b82dd55c7a5b
font_01_sfnt_off00011d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9C 10924 bytes
SHA-256: ccc32b29272af716b3f381803e5c486f1b12230b7bf45ef514ee17162142f2ef
font_02_sfnt_off000136ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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