Malicious PDF — malware analysis report

Static analysis result for SHA-256 349f215cbd28e8a5…

MALICIOUS

PDF

81.8 KB Created: 2021-06-11 08:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 15a64c96c52e9673dd8447b5593d6537 SHA-1: 092688ba910e4b0c15dd8d632e3d74d1d10aea88 SHA-256: 349f215cbd28e8a51b54d0620376193c68b12bf917539e9ed4ca2621e5939548
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and a high ML classifier score indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://infrive.ru/uplcv?utm_term=shola+allyson+temisan+mp3+free+download PDF link annotation
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/ff26f13234329a45e6dd13fb27f62001/12467258409.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/20c2bc6715e9d5b1993a64d5c51c56f9/61490418724.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/b7650bcd05b27790c43cd1568ab9b354/fidizejilokiponavozalop.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b60c37b22ac---77217362242.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbc9a2f56f---12262273813.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/95f986d63359417deb5dd815b6912839/75508629457.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/0qsgkgpala17gg3eh6jcuclup5/12351371012.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/mivulikagejesupatipesuwu.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/43877dbf761079585df3953a32f60551/sisurefapejokenapetes.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/sewajokif.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/vugurudikedugokimubipi.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/vifenatek.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/82722268364.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a60d3745491---11349916773.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16200766197114.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/415017161561621817654.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10050 5744 bytes
SHA-256: 3f82db41cdedd01613df607ec2c1bdc2b00a44f65e6a006fb3029981c073817b
font_01_sfnt_off000113cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CB 11196 bytes
SHA-256: 11be6427b4aab3ca66f4d69ceda39b8a9c6d049568ae994945ea6b6c21781d05