Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68948bd28677d5b…

MALICIOUS

PDF

84.8 KB Created: 2021-07-21 16:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 261dfbc9ef9bb46e94d30bffbc1dae3d SHA-1: 5b7c55eef12c89f6e8cca4beabfd6e1cce2db2bd SHA-256: f68948bd28677d5bc79393006264b66ed473898ccf27b9cee28fcefe21bd4a34
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to compromised CMS upload directories, suggesting it's designed to lure users to malicious content. The document body is unreadable, but the heuristics indicate a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/527fb57c8f06fd0bb1961324651a99c9/kogolixugikaxakazenad.pdf In PDF document text
    • http://www.bash.cl/media/file/35663178460.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f4c46bc2c---wufozawokaj.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/0kqvi50ar399270npok3bjti8t/88621459550.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/ffcntre5lli2k622afpr26l8ej/48801366858.pdfIn PDF document text
    • https://ewt.cz/res/file/42863278538.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/kotebironaji.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/xolonemilixumerajude.pdfIn PDF document text
    • http://staropolski.net/Upload/file/66275938853.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/futuwaporovigek.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/38669926469.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/c7915974c8237500c0929b5be1e0efb7/49368404922.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e15a5dad4---pesikovexedudijujironab.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/cca5721262540ba341a1a8f8107f7b8a/98461976416.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bddc07bcfb2---20983033695.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf5152b9a---pimuredawofaxilutexase.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85f0d9e74b---katepowomiburetupelomujet.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/59856726832.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070316345d75---jivakod.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/goxizivugujogosoxej.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/fb88751280fcd030ff53c9b3fed01bf3/tuwasobifosugunozemipenaf.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/0b9ebf482c614817d791433c69653a7b/23488263363.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/kojofojuwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=we+are+one+and+the+same+lyricsPDF 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_off0000e68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68E 17652 bytes
SHA-256: eb466ae9f5b9613c5b718e8e94f83d09d9481479de31b41a6596b56b0fcc512b
font_01_sfnt_off000114d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE8 10740 bytes
SHA-256: df0a6bc6e93766e594427501728a507b657a7c43d2d88b841f99ba2c300ff79a