Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4983bce831cb85d…

MALICIOUS

PDF

67.8 KB Created: 2021-09-04 18:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e75b7141a359a2fe057e5492ae78e16e SHA-1: 2c54a4997fa83bb0233c860e07b9cce490968612 SHA-256: f4983bce831cb85d9bf7e38e0cf63fe7bf0ffd32b906f16226be4b6e295b7e4e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised or disposable domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to malicious content or further compromise. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8341

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.
  • 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
  • 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://fabtur.ru/upload/files/nesuruwalupad.pdf In PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210605081428.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/tapimazugotojukikejigaroj.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dabf60f0e4---wiluwis.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/moguwiti.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/sewapanowibekeguzeviwiwo.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/8b20f27613308977dff8142740e64679/57693866960.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/47998079308.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/f0bbb5018d39570fd160c97409e701e8/tejomibogizukeli.pdfIn PDF document text
    • https://cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/zezagaxox.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2a242e0b5---kobetojisiberon.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/6b6fee99bd27f665651febf65927dabf/14256679586.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/kulikifikarizasanax.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/43401606892.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/padanuvege.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/sajujasakafobigo.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/25619018460.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/933d2cee58ba12e22ef31d4e63d3049e/3008148615.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/54885361912.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///rokowozinaxo.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607096b2a5a98---61301780676.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/lomelem.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/03b92afa59db6e2482e9ab5abf504cd6/likawokizerezezofab.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/mijakawusoxosigonavugapin.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/440c4b0949c1b0a8b42797769ec4d72e/fupedumixanepojalalosuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=kabbalah+science+and+the+meaning+of+life+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_off0000f23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1