Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0bedbd464f511c…

MALICIOUS

PDF

79.8 KB Created: 2021-09-08 00:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5610c001f3326f01f077869540187ea5 SHA-1: 98b87bf3f314c5f13d7c92ee95c0e2cb2677e61d SHA-256: cb0bedbd464f511c4a7625478b9a4c1eb8b65eaf078ab2b48207be4cf90b6e36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm for phishing or malware distribution. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://fine-trading-knotwork.com/uploads/media/virekenotepodamaguveba.pdf In PDF document text
    • http://helder-effect.nl/userfiles/file/52113725819.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae32228605---99816243226.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076672197f95---lagimorowiwevapi.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021062609594473499.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/3c6503b63c473e8a532fcac28920c3a1/wipizunewovexisefidusewes.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///13341620553.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/2tar4ricgs5n3mnna4kjda7ni5/vejumulasivisifilofiwuk.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/dolunesez.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b195ac232e---nozopebilupuxi.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/kobatetokulaxuvejogumek.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb07e4775b---73378023092.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d4f6c9ca3---31960015329.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/zekumixavudato.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee54c3a6d2---97546861136.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/gufixoxororitel.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/xomubuwofebi.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/d9be1293aa82aac131c61d1e205c448d/32805384839.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a8d565ec6b55a1ebb27ca952eb286ca1/9687226370.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/00a6472a2dfc0273f95bbc6fcb2b9a7c/43195406010.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/1d5c7244edf533ea9e140402f7d89614/90178813466.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/2599168233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=jeep+wrangler+jk+2018+owners+manualPDF 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_off0000d52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 16228 bytes
SHA-256: f34b55d131c60f6b90ef34488203a60f4e498e35a5e03c7892c03d0370afd4b9
font_02_sfnt_off000116df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DF 11304 bytes
SHA-256: de9474470e4b47cadfd9b8ecca5f67d81573be517ff569f4ce3311239b18c6f7

Open this report in the interactive analyzer, or submit your own file for analysis.