Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39f86fb72536045…

MALICIOUS

PDF

67.1 KB Created: 2021-07-21 04:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f4050e27c75a262a190a441bbac2e500 SHA-1: 548e44797404b88b22cdcfc7edafee125a046264 SHA-256: b39f86fb72536045e5062b4363237c7b296330becc49883b66d9fc2c747ea185
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it likely serves as a phishing or trojan delivery mechanism. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or downloads. The presence of multiple links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6525

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 http://daimarconstrucciones.com/images/admin/file/94797519716.pdf In PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/83719b40c0b92b6b7e57973902e7a554/39923909505.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609afdb233478---51858334212.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/n59q0gqmfhug1mht720sdfhaho/ragotesototuzejiwezidewo.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1jp3veg17dr60ol2fqd62hsg42/60301300150.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/12569955746.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/81593600022.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160951c90b7316---87516482418.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/35037679598.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/51546967200.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/c550c8a417067e36cbb49ad061db9673/60146715892.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160971fbd31c25---folepibiwosajesusakuga.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/fejeguzakilaw.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/garokonemiwenonabum.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/62063676959.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082996e45d7e---bojosefilifaxu.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2709fc84a775450e45e6bc9276ef996b/nopadulelezugowinoz.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/tadijafetoletiwemulutidi.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/8172b82699bcb0b4074f648410de1eb3/29800662811.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/26246aec958505f7d9e75b10088da5d8/99633173097.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160afc52d18df9---rovofesukis.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/sigeguzas.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/xugivawaselujafegi.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/3214643598.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/xubas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=environmental+biotechnology+lecture+notes+pdfPDF 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_off0000b956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB956 16888 bytes
SHA-256: d85092c782e81f6e03971c906f309da157c0fcf07a1dc7a1bc4692fe1df4f8b8
font_01_sfnt_off0000e505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE505 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1