Malicious PDF — malware analysis report

Static analysis result for SHA-256 dafaa83553e08be3…

MALICIOUS

PDF

80.8 KB Created: 2021-06-28 01:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f6e1909617e28d4fc50f59d05940693b SHA-1: efccc5477b6870a9f3a4717e0827842aae4e14e4 SHA-256: dafaa83553e08be3230ae4ba6da9be5e87e0876b1f6b5574afb35a05dc076783
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of JavaScript indicates an intent to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/66193060298.pdf In PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/d73146ed7dbf677b0e4ae615693d94e3/40998169387.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f641cbb03---xajuvodimuzakododegazixe.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/3ef0b20a8054db6d1704caa4ccae5621/sufumokonod.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/61087466954.pdfIn PDF document text
    • http://strandedtattoo.net/file/falalutebopupizadiz.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/tifozezabipiwumavop.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b7d12555b---7595651418.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/98301972629.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/kozuvegukojosuwoja.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/86390403396.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609183cfb8f6a---54532748174.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/d26d9ea78fa26d250a9381ba495d9b5b/xulewipugatugikide.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/bifaratoxabez.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/tigugasumajiwodi.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac666762c97---xazulofeviku.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb805d7178---49878469754.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608086f992872---zoxemoxomigowafabegeb.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160822a2397018---57334392595.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5641055b9---vedifatimovafatolesozif.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/wokadoziwejapoxodago.pdfIn PDF document text
    • https://inncredel.com/uploads/52163647799.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/2c95b4e5f2bf2dc5ae7344183097444c/kugedipin.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/07032b4d5080d7c7e8895c991b1dfaa4/zisukodapuxizem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=strawberry+seeds+not+germinatingPDF 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_off0000d7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FA 17096 bytes
SHA-256: 5cb71ebf28b5089b979e0c15e0c8d7cb69d13f4a7d51e15ca24ce905e9dfcd4a
font_01_sfnt_off000104c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C5 10960 bytes
SHA-256: a92f425058dcadcb2859a0a8ed8232003e950dcc12f75e60ab2533030386ca6d
font_02_sfnt_off00011e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1