Malicious PDF — malware analysis report

Static analysis result for SHA-256 b624ffcda75b7945…

MALICIOUS

PDF

88.8 KB Created: 2021-08-08 01:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 853a3929ca7bb9dd7446e31168014b04 SHA-1: 13d610a33cd3a144d42446ad47487b331d50ae65 SHA-256: b624ffcda75b79454185966caa7493ed13de74a594482f7776d3e12ed651e782
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or malicious redirection attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing lure designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6338

Heuristics 5

  • 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
  • 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://queure.ru/uplcv?utm_term=is+pokemon+showdown+good PDF link annotation
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094010824f86---49218751803.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/2588734432.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/413ff4feea9f73851949278e6dcf0071/53849606797.pdfIn PDF document text
    • http://candientuvibra.com/images/file/13183850476.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/gunetiwi.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65d38a34ec---63620718213.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/kupate.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/ketuvurojis.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/wijagug.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/b925rop05i17kr8cfc53k1gpup/magifowowizorod.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/52876495868.pdfIn PDF document text
    • http://zjpjxt.cn/upload/uploadfile/file/49760717319.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fbe1a73bd---nufiziz.pdfIn PDF document text
    • https://partnermind.cz/images/files/97761506297.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/47537571791.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c27e3ae75---daxigiputuranavufisadosot.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/38e96c42dc0ccc603a6f4b9dc26672f7/31559060276.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/31594779377.pdfIn PDF document text
    • http://carszana.com/image/upload/File/25603302412.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e45a66bd1a---67921619468.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/fosetiwewasivabuxelomiton.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210723210404.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ac23ad1c951---39994435241.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/95002868110.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/buzoxumagepujawiriwawuxiz.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b67ae4341fc---94361896776.pdfIn 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_off00010921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10921 10472 bytes
SHA-256: 33e5a8a93cd0aa43284c74796e8f9d3fb2fb710acb582c51181f9d4b036f1d17
font_01_sfnt_off00012084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12084 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13896 17372 bytes
SHA-256: d78a754cd6f8d350e91a2fb70dbf9ac6d0745fa277a889370e534c1002fd57e1