Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ebf756cc66e6a8e…

MALICIOUS

PDF

92.1 KB Created: 2021-09-06 01:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1ea2a654569f63b71fd6139fe3a0a418 SHA-1: 77baa0b7e038b4648fd36790c6984f4241096378 SHA-256: 6ebf756cc66e6a8e40e08305c13d61d2f051319a50c368706169a35dfc66c56b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document is designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=212+pizza+recipes+pdf PDF link annotation
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/14c9c8a2639df68f9556a2ee89f26c5a/18133965755.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/abf52a2d5178ffe88ef17881110de43b/fizegaviduzapiba.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/36450561374.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aee55e2827---25522894460.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/32260030700.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/4886954aca8286ce6a500ff0e2c9475f/dawimulelakojikafa.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/c1462b63683343a3498605a8463891e8/36802277327.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/ruxewakanetaxabetevofit.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/a9re54vu9i8n4tpv834a05h0hr/witeruragelubaje.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/db39db9e195b7b1240c4708907df08cc/47146302537.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/cb42e830b22cd5d77d7cfa72fc4712bf/66729579855.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-4-29/20210429170835613542.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210622_100632_8331.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/zajewinivulikoxedil.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e7bedade220---77090040100.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/209c31d7b4145f7f5f6582d4864afa98/givozumigawepudemomefe.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/ropopuvojulovinafunakafex.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/cd715fb6ad8b1ca0a3d7b27488ddc0aa/29448000437.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160915d7d699e5---polipilowetiropatojexi.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bdf5be347---21060430602.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116f02fc37f4---57330490830.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/32216330784.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091666ac07a4---bezupanazeger.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/dafilidomaxewu.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/vunabun.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_off0000fdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DD 10380 bytes
SHA-256: dfc5f64c1f66a95a4cec3d0b75b28b0cf91384a83d332b6ce86b994d5b8064c5
font_02_sfnt_off00012d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8D 20516 bytes
SHA-256: 103794369ddd06d4e1c8716cc18341c2f978a3a153ce90e55aa986fba7bfd712

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