Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff86e58fe45f8f9…

MALICIOUS

PDF

80.4 KB Created: 2021-09-04 09:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 412db2d9df240b607b51d62fb9b36c75 SHA-1: 6fded8c8ee02da256483dcb852475a6cf9364b0a SHA-256: bff86e58fe45f8f99c152c369d68979c7fbeb3fc84a853e32e9c7b29bba11677
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. The file contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute phishing or malware payloads. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=interest+coverage+ratio+pdf PDF link annotation
    • https://tatsolarlight.com/uploads/files/lidutuva.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ca90390bf---23098323590.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/4567285609.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd7d2f1e81---fajuxaxuzopasu.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/fejubinopagatu.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607401d080e5a---tepupukam.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/suzenulapezemafapu.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/5438696916.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607b356f60cb9---degaburudedi.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878aaeb1c12---55858260127.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b971ad204bffb92ee92e1f0990254ed2/birijig.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/lelivovapurokutolepubuz.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16099a66a74f00---malumafilide.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/68405601320.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/5d0f49b28bebf1362d6bfc0dfc624471/porolarulure.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b209935c696---95826501918.pdfIn PDF document text
    • http://108homed.com/userfiles/files/nikilatifotigo.pdfIn PDF document text
    • http://ahhsclassof1980reunion.com/clients/e/eb/eb0bda5e83c72ae03ef0bdd1ae4752ba/File/35361787572.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/jinejinatafojozirefutabil.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/61688803856.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/pelivigeponixisawusuto.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/90799004696.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c3c90599b---82378276605.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/kadajupavasiwileruwepol.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-19/20210619025529725763.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_off0000d58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58D 10764 bytes
SHA-256: f32f88912b494bb46abf408e0be724531edc8cd55dd821abbce861a4fef11e74
font_01_sfnt_off0000ee49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE49 17492 bytes
SHA-256: e9312ed9cb831aea76f3c6f1d22cf5cbc50d5bc6022a9e498136594749e39f24
font_02_sfnt_off00011bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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