Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91d674ad41e9cdc…

MALICIOUS

PDF

80.7 KB Created: 2021-09-20 23:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d6794ef5a40d9a3ae18804e6af146a9 SHA-1: 5f7afc51167e6286fd222a99e43f5f636023d85f SHA-256: c91d674ad41e9cdc53d64aadd2516d4de5502e28880f87a0276f3ce7035ad7e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://infrive.ru/uplcv?utm_term=how+to+send+video+from+iphone+to+android PDF link annotation
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/65886070756.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613d15b9ecf32---31383292167.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/9475926817.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/romufedewafapida.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/94525082817.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16145e1a777b62---pazijiwamigurotagosulufaj.pdfIn PDF document text
    • http://labradory.pl/file/26498083700.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/77919023560.pdfIn PDF document text
    • http://lscapital.it/images/file/jokafurotarizosopu.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bc3578c54---3491136328.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131caa4509ec---11138192342.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/64464741596.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/dawolowadirerufibumu.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/23625318154.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/zewijugi.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/zemolejejuguwavas.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/97169994276.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47861887300.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/rafokezepafaxowe.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/59238086179.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/24889403417.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/durabukuxomisifemoxelej.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/97234434678.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/51763514730.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_off0000d6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CF 17764 bytes
SHA-256: 85c0887b315b484ddfda985b1042916aac80415eef1537d6a75183af69da1b18
font_01_sfnt_off0001041d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041D 10860 bytes
SHA-256: 8e89a08dbe8f9b505f68f61bfacb0622339dca1eedd567e86a3de79d1f8a3265
font_02_sfnt_off00011d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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