Malicious PDF — malware analysis report

Static analysis result for SHA-256 867dc474e9e78c42…

MALICIOUS

PDF

84.6 KB Created: 2021-09-03 17:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cb5458c5a737361985f93b5758b23ae5 SHA-1: bcc848c8f0a99cabfb8fa0eb20ef8fd96a07fc12 SHA-256: 867dc474e9e78c420facc541b7a1806dd6aafd2d7858181321b28c995261d49a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/kr53k82kvdhbhv5qs39g2bml1e/dawuz.pdf In PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/1ade08630a7b1390d1598780b346b379/887076730.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/9gviqgn6ho7i23khmqfn3pjhgc/37159216535.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/65624760585.pdfIn PDF document text
    • https://soft-print.pl/app/webroot/media/files/46938198846.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090113595816.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/5c236668e8c755787d63c15b28c5dbda/4328111144.pdfIn PDF document text
    • http://ruihuitax.com/files/file/37199501912.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a1fb4b728da73302271c6ba171cafb73/75942089178.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/49284707971.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/nanavosuzop.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761c39ad1c3---lofexosoragadujuxi.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/mevimezas.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a10778ccbc---dekejuguzofe.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/55678539921.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/c865825207f67e7b059f036ca2ffe780/lumujadak.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/93848364214.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30e4387992---14811609798.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/8qj4thlpb4qv1338efki586cdt/65347904600.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/lebifuzonozo.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/378a5e150cca6ccbce5d4129b31e31d0/41522474816.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/relonubeg.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/78055807371.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/4e7431226a91d4f4638de96508a235cb/lirusanuroboxizogujo.pdfIn PDF document text
    • https://businesslife.com/content/file/favakorowizoxofuxavi.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846c2bd5bfb---32314855204.pdfIn PDF document text
    • http://wearefamily1234.com/clients/3/31/31b46d3307e4516335aa88350909469c/File/17980310357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=vocabulary+workshop+purple+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC659 10924 bytes
SHA-256: 1c40505f5bffc41c0ba5f9cacdc5a43eb5b0f584461ee8955adb6fe1127aa06d
font_01_sfnt_off0000dfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA7 16104 bytes
SHA-256: 4204f4a647e3e8488fc3125e36d68471fcc515b787f7ef36a685bb1e406e82a7
font_02_sfnt_off0000f4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EE 21296 bytes
SHA-256: 6af7e40afabc6bbb4803f6526d4c4a2a9d7f0dba0811786d9bc76681934fc54c
font_03_sfnt_off00012c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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