Malicious PDF — malware analysis report

Static analysis result for SHA-256 26b11d69b8dadc4d…

MALICIOUS

PDF

74.6 KB Created: 2021-09-02 03:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 3dcb3fd8d1ef2a508559d828d8884046 SHA-1: bced47450d5b6f3123dd15ef93e859f7ec129086 SHA-256: 26b11d69b8dadc4da57f929ed2c772f1290a9242886f811d95b027a0ef8de7db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://agriturismofattorialucciano.it/ckfinder/userfiles/files/lamiranuveg.pdf In PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/95498632693.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210828_173331.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/40405924694.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c792de8e9c---3503621581.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/13004445242.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/15322631244.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f6d59473585---8185930823.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/zerunagutora.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/kejoleseke.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609290be0c2ea---49243871852.pdfIn PDF document text
    • http://fitviewer.de/files/file/47987313301.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/684ff3ibnhin0729lek5947ilo/sotunogipomeju.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/36516365419.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe7ea973c7---87786845477.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/48194083374.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/zijeli.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609867ce662ce---18178731513.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/o3id6dclpc1knu937tlrnhecf0/43587358967.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a58e9fd8f06---35510596675.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/710b032c2f75024bccf18c9a7517e75b/5248790952.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/59757016753.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4a1cdfe3f---61693507431.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/16943480535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=referencing+website+apa+7th+editionPDF 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_off0000be2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2A 17356 bytes
SHA-256: 6f86f9c6cdfc1b9610d81462fa39acdc24783bf88b9ccd45adc185a9ecc4ffb6
font_01_sfnt_off0000eaf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF8 11176 bytes
SHA-256: 3d72a78faf0300d8249c652eb6905efb959bc31cc0f34e08149475620192cb25
font_02_sfnt_off000104c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1