Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfd49be68435475…

MALICIOUS

PDF

72.8 KB Created: 2021-09-21 20:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 485d31227723f212f15af92223b4fa92 SHA-1: 5a263a8ce56abd2473bf099071e0faddca09f522 SHA-256: 4cfd49be684354758c5ef2d9b7737332047134d32cde583821830a59f758a34a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The document's structure and numerous links suggest an attempt to lure users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://seidels-mineralienwelt.de/images/uploaded/file/40380470592.pdf In PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/livezavosodura.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/161435f8da002e---78950196497.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/mijanopenuwazaler.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/slt5u5lrsg27oarm0vqid33p8c/78599965618.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/37713241857.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/83255058792.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/59006902682.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/sanokabaw.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/kololibotalufubidexutuxar.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/30235513363.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/navetoko.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/nifamirevutujimolupoxipuk.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/59727947596.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/pekagozadavonol.pdfIn PDF document text
    • https://nada70.org/userfiles/file/pojomuxerefavufowuvu.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/83401122312.pdfIn PDF document text
    • http://panova-art.com/files/file/2902889690.pdfIn PDF document text
    • http://innersolutions-uk.com/file/49160394002.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/7ae8c967d7bd335a5d29686d1ad66a42/93530256119.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/bigunasufibumumal.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/nosuwepamaruriwubas.pdfIn PDF document text
    • https://csn-alliance.com/data/files/99425752805.pdfIn PDF document text
    • http://tokado.ua/media/file/48599509253.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/zuzeteda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=online+game+subway+surfers+2PDF link annotation
    • 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_off0000b9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E1 16408 bytes
SHA-256: e06314d7d99aa14cba96bee9ca97d2479762fd2b9f199c53bace6c6ee02815eb
font_01_sfnt_off0000e435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE435 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4C 10924 bytes
SHA-256: d8be420aadbab31ae83cbcb834b4dcfa25d5a5a40431d1fbe50e58847b612e29