Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e8290e5a2d4110d…

MALICIOUS

PDF

80.5 KB Created: 2021-09-06 13:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8602ee8a0827ccbe89cf3a3bf54b84ac SHA-1: 16be9b8f6db820ea29d3f4f4bf3485dd9e03681e SHA-256: 2e8290e5a2d4110d7a808eddcb0380a84339213a6fc50d85d8715ad1d70a5d0b
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

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://www.pantonerestauri.com/ckfinder/userfiles/files/8220297234.pdf In PDF document text
    • http://zartmobilia.com/userfiles/file/20210612164232.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/gujaduxovezi.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kures.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/kavaguxalitomewuguw.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/b0a57f5d8542762ae1dcbad8262f47e6/72114289670.pdfIn PDF document text
    • https://suksesunited.com/contents//files/79118204625.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/pozefefi.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/peses.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/14966038946.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4a4ccf1bd---mijefijepogusenepajewu.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/5b7b9a8e50571f35e8fbe50403130c72/51264151982.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/80393961947.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/85262840226.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/fc3e9b9594d87d8c3b85f10505c5be54/temivenixuwiwadefiwoda.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/82368159194.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/dufibupitunewapi.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/12eb7084efc4c5460beb5129c9cac57c/5821168437.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/203c833971f187bc1eb07fcda5b3a4b1/4163384921.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/6e3528899c87434b85bc146c3623d406/34057019838.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/9379fbfe2427e6b4ff026a6cc0dbd83e/tivugawo.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/64181342597.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/37536266952.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b81e95106fd---25625374068.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/299d87d9599a0cf097b9cdd9ef2ade43/30423604935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=random+forest+in+r+pdfPDF 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_off0000d99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99F 16660 bytes
SHA-256: a64dec193f75e7a1259cb7247a007c57187e0fbea53626aa4ca8e4ae828bd9a1
font_01_sfnt_off0001047b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C92 10656 bytes
SHA-256: 373a1934e47894ddaf0311b9b69cb3877f33bf40f095cfba6d42af8f68bc28c8