Malicious PDF — malware analysis report

Static analysis result for SHA-256 87be889e9644bcf2…

MALICIOUS

PDF

72.6 KB Created: 2021-09-06 11:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 25d4b76f4a55dd5af7c9352a4e38fc25 SHA-1: 8cdbfc501914ae7b2c09dccc82efad3a6d10f044 SHA-256: 87be889e9644bcf2403fc8698221a6a8f95adec035e9de860f9f9164ce48cfda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to lure users to potentially malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://indago-rovigo.it/userfiles/files/92136296766.pdf In PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/gimuwov.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f012a529a6b---zogajesevigoluz.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16106b6547edae---94683409070.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/jipofajavizumipositotulod.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f19402ff3f---padarasoporegu.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c925710b181---72256396545.pdfIn PDF document text
    • https://red-adlay.com/upload/files/69427198050.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/77193469160.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ecba6d6ce---15743438020.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/vujug.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/okcec89tt3bo30634vtn3r3eep/rirerexopumel.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zesoruvilegufepuviwo.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/vizusopegagizuv.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/35327168636.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/6831162683.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/21747322890.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/19755914038.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9ca3d508a---74734832245.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612378e0bb7cb---80196057514.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/vepukumewofafirikobet.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607761b02d029---45987844555.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3078318f29---7180537908.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/kadabajonerofuke.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/94025505408.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=worksheets+on+synthetic+fibres+and+plastics+class+8PDF 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_off0000b99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB99A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B1 11264 bytes
SHA-256: a489d0885cc32f9f00da637b53f8f1441f5531d801de77e9525c2e973728effd
font_02_sfnt_off0000ebe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE5 15884 bytes
SHA-256: a80305f73358b4f35afe386424fb05bc094e866e5fe6763e26f6fe1116e7acce