Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c2bff4c17473e58…

MALICIOUS

PDF

95.8 KB Created: 2021-08-11 00:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c1a50d66cd60fafc9fab8e988999890 SHA-1: e43eca6d764851cd2ac00021baede349c7cac604 SHA-256: 5c2bff4c17473e58c3cdb08188e8b7c01a7807c788395211cbd8d1816e550b39
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple distinct hosts, many of which are compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the PDF structure itself is designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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.
  • 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://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9584f56cfaa2929eb72367a48142546/wesatirupapuwapofup.pdf
    • http://isspskola.lv/userfiles/files/gedolifizonon.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/zemediridesup.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/e48815fd4f6fad2c8aaab99970902b52/56489854095.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c85f1a69bfc---vaxexabavipabipedifujewo.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/a08e65457426a685c7fdf2d169e4183a/nasilurideji.pdf
    • http://deshdunya.com/blogimage/file/59978141726.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/d1a2eb22eae26c572050b0fb9f2db0cd/8983440049.pdf
    • http://kstarsmall.net/userfiles/file///buwepekuxanuninan.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105010029481619.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/5f048afca2b03df15dfeb038670b44d2/puvaxazagamaj.pdf
    • http://refta-bg.com/userfiles/file/27017799476.pdf
    • https://locktactyuma.com/ckfinder/userfiles/files/gimutekamogonebojor.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8099dd7aed---42306035330.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875b5fe0add---81786716854.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd8bb9cc1d---70008525698.pdf
    • http://diacritic.org/travel/app/webroot/img/files/dogaxatajujotuz.pdf
    • https://marljivo.hr/userfiles/file/lagosometiwelejetogabal.pdf
    • http://accessprecision.com/userfiles/file/56462932666.pdf
    • https://dbjadow.pl/attachments/file/wixoni.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/i08smk34anoi0hu3mgcrgnlp4l/32248576067.pdf
    • https://tradingphrases.com/userfiles/files/27993202667.pdf
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/61779516460.pdf
    • http://kamerton.nl/clientfiles/piwudezelekazojuxusize.pdf
    • http://granite1962.com/clients/869125/File/39166169650.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/1b57315f93cad83dba333cf9d8eda218/4581971842.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=define+scientific+water+cycle
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001147f.bin
ceef0b1efd186df4984153fef491063c02c03ac18c1fea6440b5b14349f6095a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1147F 16964 bytes
font_01_sfnt_off000140df.bin
d2c667696a0f4c46eab32794682982c83f712a9b927ec6415771210a2e94d120
pdf-font-stream PDF embedded font (sfnt) at offset 0x140DF 10408 bytes
font_02_sfnt_off000158ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x158AD 16792 bytes