Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a13f858d532f96…

MALICIOUS

PDF

89.4 KB Created: 2021-08-16 13:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 40495241c2ffa80451cd43ce7bf32550 SHA-1: 10ce3e8f14f6a84b42ad967334e51dc4d2028391 SHA-256: a6a13f858d532f969dc724a8f263497e3697c0ddb37c5edabeb65f6ce8c32d52
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it likely contains malicious content or exploits. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and other potentially malicious URLs. The primary purpose appears to be directing users to external, possibly malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gites-les-bardots.com/userfiles/file/97005180240.pdf In PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/debobademonifedoro.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66bb2d8930---83070914163.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/fd022485f33d6885c6d8623dbc08bee0/nejaxevofo.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/11593185615b73bbc816ac3ed6a5e4c0/napojoxetigubaxivovi.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/39925758426.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/61314860269.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cd9d0070d34---vevos.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/89420458543.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/xoduwakudebopazevix.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/bunutelufuvepe.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/0e22eb9235a06b323788ecbb39ee30c7/21137326057.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/notik.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/sotivotowapusajo.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/fd9d5c94e80ebc06181b4a5c2d12cf7a/wifesojekefabena.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105c1df5b6fe---69075293978.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021052503491130252.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/dexunifadutat.pdfIn PDF document text
    • http://lakesideterracecondo.com/clients/41361/File/duxemexuzigetiwivajudu.pdfIn PDF document text
    • http://axwelindia.com/uploads/zususepotivivepo.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085905dba235---padidusomibubonajof.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/zolulabaxugig.pdfIn PDF document text
    • https://best-label.com/upload/files/23183266665.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/mewekatoxi.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abbb5de5a28---74974704387.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=technical+booster+tiktok+fans+and+likePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE267 16468 bytes
SHA-256: e6501eb0c304bcaf0df7993decf9b61d70dbd61aef2fa382476f2b586ef824a1
font_01_sfnt_off0000f92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92C 16744 bytes
SHA-256: f48caebfbb853f1945b9189c05744e59ccc8d243390d6651d1d5be9dfb03c375
font_02_sfnt_off000124cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE4 10768 bytes
SHA-256: 5fcf14dda77f6c7bd9e3616ac03f795baf1bc4aea1ae53ffa084cfdabe87271a