Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37d935ad3441e70…

MALICIOUS

PDF

85.5 KB Created: 2021-08-07 03:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 348460a91025ffaf0a7882265c58c792 SHA-1: a2060c24597c41adf3a22ff9cfc79ca3de57d13d SHA-256: d37d935ad3441e7077d848693cf8adad089cb3591e9e0371e9ad25cc181cbe37
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs that form a link farm. Several of these URLs point to PDF files hosted on compromised WordPress sites, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • 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://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/bsm220vfvig6q8391jpj5ogjm1/lutisozatawoxiresekaku.pdf In PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/54573681475.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/57718463919.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/er9c7oniapmop8hnn9ask3kpl2/lidamimi.pdfIn PDF document text
    • http://muszempilla.com/files/file/29320112273.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072a46212751---baxudesedenotinumuwig.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7423b95c8767820ce7440890ab35eaf/38302474572.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/riwewujerusaxidizovorak.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/ribatem.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/agst83c416ejss3uq8v67eff4u/doselamirezolukog.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d0db24e72---sasok.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/4231376087.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/e0hfpn08inmlhstitg7pqs4e2l/89211849086.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/gebexomezefeluba.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/gamolagupabulezusuxe.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/sabavogoxolipadapup.pdfIn PDF document text
    • https://electroagro.es/pub/files/94546395507.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d06634014---65187137032.pdfIn PDF document text
    • https://aedwea.com/upload/foto/dosaze.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608154c80e59f---11523067909.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/zudomenuwudisulafixe.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/89300337254.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/0f85987b410af205b048a7cfa3d3ceb2/fajinekazusederirorufeku.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160879d7976abd---40669936894.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/017ef053511dabbf7c583d09cec22cc1/wesofidetejejorofate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=badlapur+full+movie+in+hindi+2015+hd+1080p+downloadPDF 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_off0000e308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE308 18900 bytes
SHA-256: 98ef37bb6d5dcc81efe25dcdabff2b00a92d630ca1ec85dce4d899d69867b1ae
font_01_sfnt_off000113eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EB 11436 bytes
SHA-256: 99be40823e36d1c9df2b5d00677c0bc5e82cbd6bdc61e7f6fd29835299698fda
font_02_sfnt_off00012ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1