Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d524d531b5b49fc…

MALICIOUS

PDF

81.7 KB Created: 2021-09-23 08:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b22f1129d7aa9356483c8740ee3d84b6 SHA-1: 5cd7a5fb2018e50fc463747aac85f81fd084dba1 SHA-256: 3d524d531b5b49fca7e75825e20384dd57d41c954d12ce84f4cbc3f7a36ea9a9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis revealed embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress upload directories. These findings suggest the PDF is designed to redirect users to malicious sites, likely for phishing or to download further malware. The presence of embedded JavaScript indicates potential for client-side exploitation.

Machine Learning

  • Nyx PDF Classifier clean score 0.2214

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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 http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161413a5996920---9590858794.pdf In PDF document text
    • https://truckforceone.eu/upload/editor/file/74271430020.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/barazovesel.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/botaxijofisofawim.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/60399093232.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/45640524553.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/47778469889.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/vuripoteretutalire.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/67702095375.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/nogulagamifowoke.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd0ac1bba0---tobedasurasuvedipu.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/nesogififa.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161336e340fe50---30007763803.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/tepejowususaseranebobe.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/11757613081.pdfIn PDF document text
    • http://prosquash.by/data/rorabizitoniwidar.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/68885945970.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/rixewisamozowawutimun.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/21250429352.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/selevawusosafiwiwurusopa.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/42118207685.pdfIn PDF document text
    • https://langumeistras.lt/i/File/mexigirajukikisetivefine.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/lifuxekivoboneziwebuto.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/musaxexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=ebaba+entertainment+appPDF link annotation
    • 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_off0000e982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE982 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10199 10204 bytes
SHA-256: 699e857afcd36b1de746ab213a90b92b826be0c1127de707c6e17574b038e918
font_02_sfnt_off0001182f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182F 18072 bytes
SHA-256: 1022d68669633eaefe5bf4f3eb92d6948c086c07e590df26cf42720577b68cb2