Malicious PDF — malware analysis report

Static analysis result for SHA-256 65bb0e8c11f05e05…

MALICIOUS

PDF

89.8 KB Created: 2021-10-07 03:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ee92a65c56c5d1c8daaa3878c6c6820d SHA-1: f3c386b14e1490a74ce2d4a52c9b4ff835b3c7a2 SHA-256: 65bb0e8c11f05e0545123146530272496777d74c4e8b1bd30c6d1746cc8eb1b7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised websites, indicating an attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) and the nature of the links suggest this file was likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=cotralian+for+sale PDF link annotation
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/999f7731bb59382fd743d9800d2c2765/64748145716.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/sowuxuwolalipe.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2109171110381074547s45xa.pdfIn PDF document text
    • https://beautydent.hu/editor_up/43347660787.pdfIn PDF document text
    • https://eventaipei.com/upload/files/50908857290.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/tinatukotosetogojedafet.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/kabavoxekekunetawoda.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/meboxipojurez.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/43127148465.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/22531777528.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/nesusuv.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/80414391966.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161372acdcf70b---lafubikiseko.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/17112671173.pdfIn PDF document text
    • https://susta.vn/userfiles/file/vasenazizufodosotefuru.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuvorujazenasos.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/23665762760.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16152522361cb0---dowobonijemaxe.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/19558641769.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/48804231086.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/tijijofadopur.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/25358309518.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/guwafabogex.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/63989275321.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/40518454688.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_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E72 20524 bytes
SHA-256: 3bc8a9cec04ab410118e530078e6cbc2f35172730ac315ee3c04d74f0f779b32
font_02_sfnt_off00014295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14295 10236 bytes
SHA-256: b589127dc2a66fb5f26302063a6a62e08d7727fe99b81d36f8c4c765010427b8

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