Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd33090c4c8952f…

MALICIOUS

PDF

98.6 KB Created: 2021-07-31 13:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5c2e54b54052b7188e30f29f475ac9ac SHA-1: ed012f1b7643571b56958a27d851bf32b97f1f86 SHA-256: 9fd33090c4c8952f417498335e2529737dbd3938f3d913f90540ed24d1dbdfcc
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. It also features a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to obscure the ultimate destination. The ML classifier strongly indicates malicious intent, likely to direct users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=macbeth+character+analysis+worksheet+answers PDF link annotation
    • http://kleiberit.ru/files/file/zeputiledeni.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/jitos.pdfIn PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/f37eb6b3eb75424ab1130cb0dac0d077/vimokuwozifufokoza.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/77956391322.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607ae21eba230---roragopafanegedor.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/56768000436.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160baa0f3e45f4---vuvuzimimesamizonapofim.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/fadojoxekokelivipen.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/jimebawofududowivadezomug.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/i2tc0hbo7nn1c5csfsh866etc0/bopawut.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16079894d75d37---97665815004.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/romozidipokax.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d81d2d5e28---wexirodetota.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/eq7fpjah8c20fqpsajl031b0hm/78108849653.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878947e8650---xifureneferemopagofakem.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/vozegiporogajonifimumu.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb786883bf---45729159744.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/c8f38184d8a5d07619d0dfca90eaa098/polexajevozogejabokolozet.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/27935931748.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/lqrhog9b3ft9nbqp34f126q4b0/geditofosifodaxiwamikug.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/89bf2d455177135f4f7310bf81fdfbaa/41077110141.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/nuxelirusifimi.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160714293b1193---sevomudizitagekujati.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210707_050556.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_off00011e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3C 16996 bytes
SHA-256: 1a4cd8bc90935e1f1f30a5aa81e7c034cb37baed57659ab013000d4bc83097dc
font_01_sfnt_off00014a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A3A 10752 bytes
SHA-256: c82de51695cbce6615f01f1276fca2da1abeccfe246a7c7dfaad6bf9748ef6db
font_02_sfnt_off00016305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.