Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c1c975c6b0bd74…

MALICIOUS

PDF

68.5 KB Created: 2021-09-04 13:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 685fad3923c501141bbd13834134db47 SHA-1: 789ae6bb3f175c2799009c1df23a203c53cce384 SHA-256: d2c1c975c6b0bd74648cd53e0145b03c48d99577e2cac861f78a7e15cef9f858
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://stsaischoolamritsar.com/slbdavbatala/userfiles/file/73176348425.pdf In PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/e073492be8da750b5058e87c2bef3139/vokumofojijurunu.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/falubogizumepuweza.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8b2bec51d---wesamowoxevez.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/7de367fd4409e83ba145fa57f922904e/xirosijuxovotof.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cbd62da87---25926734168.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b40818524c---vatinurufofasas.pdfIn PDF document text
    • https://xn--faade-zra.ch/ckfinder/userfiles/files/16673327917.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/72682237208.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/30341972338.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/39139868959.pdfIn PDF document text
    • http://goref.ru/files/file/68965774744.pdfIn PDF document text
    • http://vodnik48.ru/content/file/49968186692.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/rofegopisip.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/vawiw.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/zugagomifipilokifiw.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083476d8bfe8---1157334829.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f726d8645b---fipesadigex.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2019dbdc8---50369974774.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b67952d0e1---fitug.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/fafazekus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=procedure+manuals+examplesPDF 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_off0000b061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB061 10688 bytes
SHA-256: 0a96656d6cd2f20f14470f31eb253bfe04876a69c121e966906f101f06bb55a0
font_01_sfnt_off0000c8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DE 14492 bytes
SHA-256: 414de1d80bf5b193e2cc31a85473d8700661c58ab98277ba24f149894669f027
font_02_sfnt_off0000eccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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