Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b767ca0cc1f43a…

MALICIOUS

PDF

77.6 KB Created: 2021-09-04 21:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d7d900b5d5bb955c233ac33cd50fc633 SHA-1: 0e238eb5a93e85a319d4c04f65743ef81f0562f8 SHA-256: 38b767ca0cc1f43ad1e3913601c1b9b4b96040ec6ba18ee58a2fc8ff63f7c452
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress sites and disposable hosting domains. The embedded URLs suggest an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6359

Heuristics 6

  • 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
  • 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://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085744154292---gevijufodetolodag.pdf In PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/bd39f9af0ec10fc3d662c17cde4a29e0/desotifugi.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f06f2bc9dc---nazujuxebuxawizeke.pdfIn PDF document text
    • http://tfforming.ru/d/files/webemomitexon.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c019e6aa8---28719367368.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/29356405518.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/0ba10361a0095bd344dd43cd98a99bdb/69786910169.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/6265792592.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b9e0663c4---pesenogeterivugigumone.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/rakamilegosogutimopax.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612aeaa38f1cd---11101810186.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/56922088429.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/lizejabo.pdfIn PDF document text
    • http://caryhigh1987.com/clients/41333/File/tuvinosurilatonazur.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/88db9750d0c65ee59831070fe16abe12/fovubinufafogatiji.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160903e2084d86---puximebuworozofagubepubil.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ebeea251e---saregeb.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/184bd21baa76d242f86a6b244458fc52/97840309066.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/risixufukobetekewoxafufo.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021072811400577.pdfIn PDF document text
    • https://gameclub.by/uploads/files/39305163073.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/a1ee64cc17c887f212111e006cd86dc3/34489943773.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/68764ec23d56462abd8c6afd11e906a9/jobalosikolugadapenuzedi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=directorate+of+minorities+training+schemes+pdfPDF 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_off0000d709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD709 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF20 11024 bytes
SHA-256: 24d63b0d5bd5e177c08b9e2e19e2e86a415cc88e452f0501a02f2fa3fce9de2b
font_02_sfnt_off0001085a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085A 18192 bytes
SHA-256: 959d74d4721dfa23c183b6cc9bf073bc9387a6b42e0ec73574481965d824aa49

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