Malicious PDF — malware analysis report

Static analysis result for SHA-256 735d2bb542b0be87…

MALICIOUS

PDF

62.3 KB Created: 2021-09-03 22:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c152e0b7dc3653cef36654f427b0d83a SHA-1: f70784f6f6d48fa0a649e6076acfd508ecf79a25 SHA-256: 735d2bb542b0be8787f26f9ef866af915924079e112fe76817be4590d5d46713
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a small PDF acting as a link farm on disposable hosting, suggesting an attempt to lure users to malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7193

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://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/214726420cd0a731484a58384815d204/46074019357.pdf In PDF document text
    • https://secolink.sk/userfiles/file/panigujinem.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/larojipakumasobifuragi.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160742cc955d75---47366774656.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/03469d6d4ad23a8f8ea32c154a91731e/47282597927.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/rasedizuz.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11a3c7e36d---17903135775.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents//files/zekenuvukilukifojez.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/012ae745e4c4d6366e1eaf1bad0c6ac1/xeganivewu.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/63004810919.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160856d01e97fe---21933036625.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4221854981---pupilanezeje.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bef3ad0e093---85695571590.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/25948244784.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/rasanupinoxomupetojo.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/kozejakinek.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210723_c38b7.pdfIn PDF document text
    • http://menafundinfo.com/userfiles/file/gusagiwozogorok.pdfIn PDF document text
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/lajakuxela.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa74dcf6cc---81918889426.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/32128641123.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609380d91c67e---29699529913.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/59268316533.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/n37bstj5beu6pknkusqd48tbq5/fegokal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=piping+study+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE96 10328 bytes
SHA-256: c5e658e5a989e0e62d416600fb7eb26a1cead3458d4640b7b2f6fe7325590562

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