Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdbea8327849dc26…

MALICIOUS

PDF

75.9 KB Created: 2021-10-08 03:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 48d5486c757d9bcabad2a974e678f001 SHA-1: b424144f188a2e51373763cec04452411cff3b00 SHA-256: bdbea8327849dc2644820cae29c1c95a326505e583189e6f2c68b32bdac0ca63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to disposable hosting and compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload. No scripts were extracted, but the primary attack pattern involves luring users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/331c56g3j85jcahv3m47a8do50/45450100852.pdf In PDF document text
    • https://22importexport.com/eimages/file/98640646420.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/kigafuvide.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109101745229681.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/sikomabedokesoxurugavemos.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/37819006888.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/jilarideseweleril.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/89592867168.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/mupoligomagupasujap.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/lukidelar.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/mawawabimaxilaxozakodoson.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/66376280604.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/rusegufetokiro.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/nkjto1euu5jjrbnho3sd1kd769/waxoseke.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/47536218906.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/vusibidabaza.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb7538c21f---76694613862.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/99317099046.pdfIn PDF document text
    • https://digireg.sk/upload/bepavigefazigo.pdfIn PDF document text
    • http://tobolsk.fluentrussia.ru/img/content/files/mezobin.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/29500792516.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210919201136_767146559.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/94071985339.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/69418890039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+form+pdf+from+imagesPDF 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_off0000c5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E4 10768 bytes
SHA-256: ab7fe2a1a4dc8e9b38d917b9e3278e559ac5a75243f469230f5bef7c470ad24b
font_01_sfnt_off0000de88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69A 16824 bytes
SHA-256: 80c0f26f21f1200d2b69cd24982788dd7ec93f9a636808bc1180a1f7b98b6467