Malicious PDF — malware analysis report

Static analysis result for SHA-256 cafd2c52e53f89c7…

MALICIOUS

PDF

83.1 KB Created: 2021-09-04 07:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4de690ea22a9d1edbd38538d709ed73b SHA-1: 1d765eaccdd06ed294a0107dd12fcf8f209c91b0 SHA-256: cafd2c52e53f89c701e6a40c92baf253c73a6a911b11e549a6e7a735e5f7e27c
156 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm for SEO manipulation or to distribute payloads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/2680b6cc62c64fc38c3bcc2864acf23c/movoduberatomiride.pdf In PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d93c757576---61169918856.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/67483967604.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/zonerozo.pdfIn PDF document text
    • http://fairmonteast1978.com/clients/71195/File/lavosivudivokatanexigajav.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/lumagabatenowaza.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210831064546.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/1163420609.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/nevuri.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/27308876751.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/a3142c49110313343a7c5b6ca3546bf7/94134292444.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/44336577350.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161176258d5474---70539987449.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/93700099866.pdfIn PDF document text
    • https://btegypt.com/file/23510761072.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/65185551070.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/6bf1cdc7cbb24275d51b94d62cddbd1e/67131633052.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/tubadukikovavisipenazuli.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160adb6986679f---zosuluvetuki.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/58057025736.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/kekul.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160968440b29e3---bepupejetofiretazeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=general+electric+refrigerator+repair+manual+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7D 17908 bytes
SHA-256: bcfa3bbe0aaaea030f81ff13ae054a5c8af387fde5251ef4158e65d43ce391b4
font_01_sfnt_off00010d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5D 10936 bytes
SHA-256: c5fe237177a715b9ab935a0c5a114b064dda32e6a0c4acaa352ea46c2100f495
font_02_sfnt_off00012681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12681 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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