Malicious PDF — malware analysis report

Static analysis result for SHA-256 15bbf64432a54c48…

MALICIOUS

PDF

91.5 KB Created: 2021-07-31 13:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5fef191eed74ac851c0a90b42c3d8fe6 SHA-1: f62f7ac4ec222a97c95529faa876031ad8ef3a25 SHA-256: 15bbf64432a54c48eff8a8eafb6c182ffb67ef63f6f6398095b7edc726e5a541
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba1aa24a8a---gapesejasuwovo.pdf In PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c95d6373be4---19031255300.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c3e174b0c---korutiwem.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/18346281522.pdfIn PDF document text
    • http://aimic.com/userfiles/file/tijokefakuxokesajosavezo.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/guwujujokiwipelogop.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/e6e238b03b7ac453954d37b9eb33032f/87493513835.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/bejafofirajubekurupomefa.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/39338968043.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb2f709123---nufukuvidod.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/dasolaxazofugabidalinotan.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160aabc849c3b5---86808902695.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/50064519182.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210630120845_k5f1yf.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a5466e63680---10557175304.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/sebegarufegaba.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/gofiwanekenekugorore.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b0876b9a968---23921725362.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825c01b4e6d---vefonogaxifax.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/bagen.pdfIn PDF document text
    • https://denimder.org/resimler/files/87907537550.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/5fa836e4668583633ef8df4555371a8a/diramifewaj.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/jobes.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ilg7qse7ahfedf77o4tj1vpn7h/zaxuxikomakepopenigopeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=reached+ally+condie+free+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/bc18b347c3fca5bdf53112a117151b04/53376699923.pdfIn PDF document text
    • 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_off0001004f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004F 17484 bytes
SHA-256: 479cd90bd8f61bd92f4ebf60202df9f885bfceb1889dab5f8f9a4085df02f46a
font_01_sfnt_off00012e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14650 10612 bytes
SHA-256: 8d4522a17e4b53c996f64a62d9dae4edfde82bd5f96e382132384562a1aff5a2