Malicious PDF — malware analysis report

Static analysis result for SHA-256 749b3440bc6cd86f…

MALICIOUS

PDF

43.7 KB Created: 2021-09-07 15:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 2cea63ab99ecb1ad66738753f4a2d599 SHA-1: 3fe715fd2f493125cd5b99561b18ac315ceec5f8 SHA-256: 749b3440bc6cd86f3065bb2288e3f6b9835281981cdf7733bec44694ff951099
182 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, contains embedded JavaScript and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5294

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 43 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://philabc.ru/uplcv?utm_term=cours+figures+de+style+pdf PDF link annotation
    • http://allnatureint.com/userfiles/file/50628303236.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/49226226019.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/lvub58otq07fv3eh1ufrepvnln/22988077108.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/zepowobituz.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/89352297261.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/birilinemubekum.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/9efe6ffc5e66497bf4d0881634936675/82521869504.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612510c9aa9c9---losakubonubejafaluj.pdfIn PDF document text
    • http://dakov.hu/_user/file/22753782499.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/rewojexa.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161160a9962ee5---87815564861.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/ajig38buqqe0jibe449lelo2me/sujidut.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/d79338474b4f0e43ac44e6e004087e47/suvifujuzepirasewozeka.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160885f2d6c032---jajiditarepobokiden.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/rabimuvisurilowogedus.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/koxakagaraxenane.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/13994599755.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/3f17348b58cb345351b4f3a64212ac87/wolojorekudokojok.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160925cfe10a37---40498213118.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/99718830610.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/60917369568.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-31/20210531015441336919.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/36903088241.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/fipele.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607adf0d81e6e---misizuvekoranazu.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/79806049905.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/piwojuwufebo.pdfIn PDF document text

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