Malicious PDF — malware analysis report

Static analysis result for SHA-256 238d35cd4b41efa8…

MALICIOUS

PDF

77.6 KB Created: 2021-09-20 09:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5f6661d19a3c0c3c63e32c1b1b6eebf5 SHA-1: a88f7df60374ec5f90bb1b2d9adfb1dd7f13b7c5 SHA-256: 238d35cd4b41efa81b703b3a4a91eca35ee33b411254c4f88aca4cf56cdf7a3d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was detected as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs. Several heuristics indicate it functions as a link farm, with many links pointing to compromised WordPress sites and disposable hosting. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5986

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://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138e84e4d8c0---bozividin.pdf In PDF document text
    • http://jyotiacademicpress.org/uploads/file/kedumizodud.pdfIn PDF document text
    • https://luminex.pl/upload/file/2333179477.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161328f2623814---wisipasoduzonadunanado.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16137d20d78532---wobajibukiz.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a18e7ee2e1---11648308422.pdfIn PDF document text
    • https://matratva.in/userfiles/file/55841271700.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/sowinu.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161421252e8ca6---53535400105.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/64366368993.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16147cf7abd34b---zefafi.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/salivitaberutotepisalojid.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/55e19d6c8f3004a15df179abedc775be/lokifewanunamepe.pdfIn PDF document text
    • http://juncheng.tw/upload/files/pazaxenotudisuw.pdfIn PDF document text
    • http://i-dron.cz/data/file/zidivazuxalu.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/28978842675.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/jezorogalakunoz.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/39eovd6thqgglhrfekf4c7dth6/vimogaxip.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/9512366336.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/f8492ce9fbf8f549e850fad552c8cf11/lomolawogovopekitevamo.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/temiwemuk.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/wujetekuwigufuzozarepaw.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/suxavezus.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/qvm21u6289igtkbcqsh2flu8jh/kasutudi.pdfIn PDF document text
    • http://mobiliteit.nu/files/2336855083.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/zorigofi.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/87103534044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=wifi+jammer+app+for+androidPDF 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_off0000f7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FE 20568 bytes
SHA-256: acbe0e50d9ef77cd382b000b2042566e497cdc1db1ec5fbe00a05d5649b94a75