Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbcfc1a7e7b5aecd…

MALICIOUS

PDF

69.5 KB Created: 2021-08-01 02:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b18802959224b5d72c1203c98b8284f2 SHA-1: f767318f50ebc678eac7e5ca9836f5694cecd54b SHA-256: cbcfc1a7e7b5aecd1a98a20209b728a7e9a15695316b6f99e5172d9343dfe088
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised WordPress installations. The presence of these links suggests the PDF is likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7990

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 https://drafthe.ru/uplcv?utm_term=how+to+insert+a+checkbox+in+google+docs PDF link annotation
    • http://rydelko.pl/userfiles/file/12121157817.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903d5918cd5---supumutoxizukosedorubiter.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73a3aab53---85653460692.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/j3a3decgq95ao8ivje3gn4929i/femixiwejitim.pdfIn PDF document text
    • http://shosholoza.de/file/dufoxofezeg.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/cf117a061b4330dbed77bd13375caf9c/5969812659.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/84241111713.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f2da1669585---32934246811.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086fbe3bf0d3---wejesizobunugarikipabet.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/cj317lnhck7j6qb0omlh8kaam5/24695197224.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/6f02a5b9e0ed7b53fe1c905d771a9ac7/37771957680.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/63974556751.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/09584resgtcmcon7psd8uph162/notusafewabis.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/15990637120.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/46874646843.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071e09045eff---9856125485.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105151224154312.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/sujexakebedapa.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/1c9ecfc8d496df35bd76461d1eaf203c/25130430585.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6001fcef55---95817074660.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/73619741976.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ed0be539b---97101925389.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/95f411a7d888de1e4ef0ba8c05705d97/dekifenej.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/rotogn8c7gt861m74qf7j8u992/12263233566.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/tufazuwukalamiwivov.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/piwupajureruxipulisu.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_off0000ccd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD8 16056 bytes
SHA-256: 8158289a8e15abc8c83a88e94549ca7cbd11782ba2c1607261f048e46ab6af75
font_01_sfnt_off0000f682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF682 11060 bytes
SHA-256: e82384d008c99ff1ae2b949b4798e37ea027842c41882ea0d086a7e2cd724f0f