Malicious PDF — malware analysis report

Static analysis result for SHA-256 5428d8d7b835c6e5…

MALICIOUS

PDF

434.8 KB Created: 2021-06-14 15:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e89fea1b46f8aa44972906bc52b77be1 SHA-1: c406103366352e295dbef38c331ea482537200df SHA-256: 5428d8d7b835c6e53f5f94c7617a0e30b3665edcfd090ae5a6c7b623c6fb112d
134 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains an embedded JavaScript stream and multiple external URIs, one of which points to a compromised WordPress upload storage. The embedded JavaScript likely facilitates the malicious activity, potentially by redirecting the user to a phishing or malware-hosting site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9853

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=one+piece+luffy+vs+katakuri PDF link annotation
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072bbd24946b---rosoguv.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/gtfbqqd4akosdlp7vk98qar3v7/94554623391.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc81d8ff9c---watusugevesegiposowona.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210504005759429867sx1ta6.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/lomapulejuji.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160baafef4161c---bagekatelotuvofoxe.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/ff8c5f5c3c5762fef9a6187de102b4ef/gamemogavojidemib.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/nejukowumesoxusinisutor.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/juseruwopedozep.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/6e3o75tpe63dn0mmbr1m9sdqb1/29415441912.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/64685008714.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/7o814v6vlu6t9pctcnd16csiqu/zoronomafatad.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ea77134e9---34509681129.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e621254726---13586956211.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/20151141415.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/31465c5b2a12910775c847697ebe0b7d/lemuzimilubifew.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000397b0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x397B0 253664 bytes
SHA-256: ead002e2209d538a3712f1704ed9354cf5f3de4ab94326139ee2927f4ac15274
font_01_sfnt_off00067d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67D05 5264 bytes
SHA-256: d36ce0956cd7b06ddbf87b11d3aafe9c99ef0e618fa4976db23f4255807ea3fd
font_02_sfnt_off00068f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68F0A 14576 bytes
SHA-256: 07e56588936816c401658002cfc6a91d3ec09803f24f200f67050222311a13cf