Malicious PDF — malware analysis report

Static analysis result for SHA-256 945933395ae4ce97…

MALICIOUS

PDF

80.5 KB Created: 2021-06-26 14:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: be2c913df13d04beea38cb59b6ceebe0 SHA-1: 3861e8553d676a832147a467db3621e706b0935d SHA-256: 945933395ae4ce97a0875f0cd020fe0a818c61dfdd7a2f68cee37cef9065faf5
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs hosted on potentially compromised or disposable domains, suggesting an attempt to direct users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts and links per host, reinforcing the link farm pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://arcomproltd.com/userfiles/file/9405226084.pdf In PDF document text
    • http://vizit-k.net/uploads/editor/files/88049839533.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/9p5tcsj68pag8c73273m4552bs/jiwedekisusajixukiwixoso.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/pesih8n66d6gm3krc7lnl4582b/65031701872.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/pimozugodirokiwemumax.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/wejusodobokefekafiluzulu.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/21145217688.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/9c6a9et0gojlq9ck2uamg7f76o/6196492118.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/94e40f8cce6912712cc5358323b2251b/73099818745.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160977ff6943fa---34978936708.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/sasop.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b66f0d793e0---78208737945.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088385a77746---48357721521.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1621630737.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/da7e75f03d7032af1a66b960b13409d7/66220857713.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/dojafegabewukizemefi.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/21639108816.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b836df141b0---zosabinew.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/b97f1872883660a309a8524dc48edd63/tikejolelokepovijara.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5cd14a877---19186735835.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd8096eb7c---zulilibor.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/2e7cda6a2acec65c12abd343e2aa6db1/feluv.pdfIn PDF document text
    • https://carlojans.com/cms/file/28096918840.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a60a49d10f5---32562014825.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c00bdd022---39856110576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+remove+watermark+from+pdf+in+mobilePDF 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_off0000d894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD894 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AB 10864 bytes
SHA-256: 5273056bd67cc60c2b9a4e419785ae81fcf6e8df415bdfe9da12cec86d8dab1f
font_02_sfnt_off0001097b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097B 16560 bytes
SHA-256: 72d1872c495915399531b74f50234a4c96508c2f4094da36015270c56af26652