Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ae01e73a7804d4…

MALICIOUS

PDF

74.9 KB Created: 2021-09-03 08:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 89ace5267784015bc47de45a50ad7920 SHA-1: 9878dfc8a6654c57c96d58c63133726a5941d876 SHA-256: b7ae01e73a7804d46327abf1930d8edb8d39ece8f7244666294e924e5f2b2f18
154 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 contains a link farm pointing to multiple disposable hosting domains, suggesting an attempt to distribute malware or conduct phishing. The presence of numerous external URIs and link farm heuristics indicates a clear intent to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6883

Heuristics 5

  • 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
  • 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://khotelmarket.com/FileData/ckfinder/files/20210805_10802656D79A7B73.pdf In PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e8075f42f---kusijiwefu.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/masowijosekagavun.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/86429819114.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/11141777054.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/buwetovonolejiramix.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/jenaterodu.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6b0990a16---33268190362.pdfIn PDF document text
    • http://sherylrobphotos.com/clients/56056/File/56290409822.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///9127645497.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/6a35a3fa91d163c1290f53c276f722b2/wujibosixefapuzafovo.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/45641660268.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/kutebosubugukepedinixu.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a599e919a20---75539289699.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/voxikunela.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/529069ac309ca93d1cf2e5eb743d4457/sunimabizofufuxubupopob.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/lolagetekamawokixabasof.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/073a39ca0c8669f4963fb88333a3e4d2/87404120399.pdfIn PDF document text
    • http://www.sanruou.com/app/webroot/uploads/files/vevizewegonawa.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/4r26mll545v6bjc5s5pqtbfod2/fizotidu.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/48363358359.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee55d5c86f---55151619795.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/17746617013.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/48687411656.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcecf810b8---zuzuropibugupadibezevuk.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210822151009113.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/pudotepovupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=idbi+bank+rtgs+form+pdf+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE941 10976 bytes
SHA-256: c7d382cee32741cfcd16f7e84738f98214e6e5121bf85c24b7b4eecdcc7a1986
font_01_sfnt_off00010258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10258 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1