Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ca30e3ca0ce87b…

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 06:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5cd1ef3aeebddb7275161126fb249498 SHA-1: 9107453ffde1950d2b233e69df3d6da660a733b9 SHA-256: 26ca30e3ca0ce87bdce1cc2e0a23bc3e968d384929d8464b96064d54eaaf2818
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=pros+and+cons+of+custom+rom PDF link annotation
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/93628656236.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613072f42be9c---72085514934.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/36602774552.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462c10e2eda---86758168406.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/8517555791.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/50049361554.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/jugalesidogemuve.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/59456266925.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d8212b3ee---3515072184.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/23943582172.pdfIn PDF document text
    • http://dsagco.com/Upload/file/26750341044.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/88545950756.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdfcb88bbb---terojumigagaj.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/81856159091.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/47445923197.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/zomuzukarawuw.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/cb4q7d2nh4k2c71m7cm4f4hgbo/xuxagosikutenemegi.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/palulusanafesef.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/zekolivagoweto.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/risezapebujapififu.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_off0000d63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63A 18016 bytes
SHA-256: bb37850d1d9953ee61d4362ea86d6688477790ee0ecdbe728c41d6831c2d82fb
font_01_sfnt_off000104aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC1 10468 bytes
SHA-256: adc82850594eb87025db5aa367a07a59678e0fa49e42c07f91f4d6ad3aa5b901