Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0707e5f3a7151f…

MALICIOUS

PDF

112.4 KB Created: 2021-09-04 03:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4ca2a7986dec26d7da0615846fa11edc SHA-1: d45183aee27849ca9377a947a31236966b55315f SHA-256: 8f0707e5f3a7151f3d7e32d95abb67358ec6117dbf05a2b6dca54b959d9cb974
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs further supports the attack pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5044

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://smidgel.ru/uplcv?utm_term=local+anesthesia+toxicity+pdf PDF link annotation
    • http://elturo.ru/img/upload/files/73472850100.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/13150567862.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/5c4qlkbbik014895ubj2s69b9m/64397324734.pdfIn PDF document text
    • http://runo34.ru/attachments/file/69815129046.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/61894901878.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/kogujesepovod.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099d0ce88aca---14298946907.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160944c82207a5---petusiluxonaziruwufi.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/luxomuzawikapedabemifob.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/efieooqglbrustaq9ei8qf8i7v/rapodakeliperepaligo.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16121a7ded5407---funadesuxe.pdfIn PDF document text
    • http://www.bash.cl/media/file/muberojixejetopodewiw.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/50737993864.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/naguvapokov.pdfIn PDF document text
    • http://kunbot.com/upload/files/mimewajoge.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/21579156546.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a384f091abb---94916939241.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/c655182536bc921865fbcfbd81abe9f1/dujisawepixaribelisewep.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/781bffcde6a56acf5f31700eace0f43d/80184149734.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/bazubomide.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/4990498455.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/95573632513.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/sikijidegaviwuwinu.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/6ac4aeb982f997df9cfca742217a3866/jugogo.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b601be4cd2c---44487925372.pdfIn PDF document text
    • 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_off000179d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179D1 10792 bytes
SHA-256: 0983519a465d2588f95e7066d94d780f436b523d35b4ae83836ce2b2be97f8ca
font_01_sfnt_off000192a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192A1 20032 bytes
SHA-256: 94aae20575c7b212c8ab35f1ae414ed570ce6531f5d160be73a354f5a84b047c