Malicious PDF — malware analysis report

Static analysis result for SHA-256 811278fcc92688fb…

MALICIOUS

PDF

72.3 KB Created: 2021-11-12 20:49:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 75955b05429ca90656fec1ed703ea6e5 SHA-1: 5efc8e46a6782f6cb49c5f72174e911189bd734c SHA-256: 811278fcc92688fbdceaf5e38738468ce656e71ce5f865bfc7e78e80bd3a52ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://nomylo.ru/uplcv?utm_term=do+and+does+worksheets+for+grade+2+pdf PDF link annotation
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/08e3175d3b66ef1b494047cc587fde2a/gilulitafewigofumosufagaz.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/tofutivasebovowepizusul.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/11415291667.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/99480510022.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/razoloxigapisokagaxag.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/33132818579.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/c271f06513a56c73da992e6f8c2fc08c/pugowulen.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/87955549343.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1616040f32f201---mazasaxaditupenizidol.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/70751088680.pdfIn PDF document text
    • http://220-wm01.netdbhosting.com/file/66477645559.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/29102828314.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/d62fbdb8313a630e51e2c3723941544a/dibin.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/27317410010.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/47613691564.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/7lq5idbflji80q5nes14mp6pai/1443676395.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20211107030908.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/192005459.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/fabamenekipadoro.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/gufamafepebababomebuxin.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/67260308971.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/zowilezunu.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/82127707245.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/66807839849.pdfIn PDF document text
    • http://4yoga.by/pics/files/859465772.pdfIn PDF document text
    • https://duel.pl/userfiles/file/nujiwavapo.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_off0000b7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DC 16508 bytes
SHA-256: f87568d980b7eb35038f1004d6e6eb0f4b03cbd9522478dbe85d2988fed71e17
font_01_sfnt_off0000e307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE307 10940 bytes
SHA-256: 2f718a8aedb5c91f338a148fc5d3224ae16db9c0671f12ff6d4e435f172a601b
font_02_sfnt_off0000fc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC46 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef

Open this report in the interactive analyzer, or submit your own file for analysis.