Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93bab2401ee2bf1…

MALICIOUS

PDF

81.7 KB Created: 2021-09-13 17:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4a46ac15779143955c4eed801d171973 SHA-1: 94b5c194103d59e068d187bca60bba502d881da6 SHA-256: a93bab2401ee2bf1cfc7664c6e60070df661f2ab3dd89e514502291fcdfa4f73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable domains and compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://dsraxys.com/uploads/walubifeje.pdf In PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/94537767289.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/87779966410.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/9841632345.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/48757095391.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/wixevabemipugezogusoxa.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/zeniloxevikuvaki.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/ea96f1e687ea39cb98d97efcc2ace9de/kedixivamutan.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/58887525059.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/41267393070.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/60373248695.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/19780951235.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/gevudodazibadezulobixux.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0e55ce2bd---zivagurulabe.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/84210144858.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/vatulelapamuvojuzujak.pdfIn PDF document text
    • http://samtekelektrik.com/files/72279809634.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/25796376451.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/vavom.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/degamerijodarixitameket.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/xujifuvelubel.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/d936806581f7cea4ac6ace35ae67c4a1/ludozokapotobab.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/d0903f9437152306b650a5a235fdeaf4/bunolufevelamakapor.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/23262856769.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/161396f97705f2---jojifopagel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=dndbeyond+character+sheet+pdfPDF 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_off0000daa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA7 17456 bytes
SHA-256: 0b3f05bbfa67e72ca2a4f3edbe449e97aad9034b08f1ac668caef357e38a28e0
font_01_sfnt_off00010826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001203d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203D 10832 bytes
SHA-256: cdb24e2fc85f4e579ea51bd1b220eb7d228914d1377bc1b0272a80df42a26dbb

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