Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb1cce16d02fe21…

MALICIOUS

PDF

111.9 KB Created: 2021-08-15 02:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3d47d0bd70a4d98620c8da64b2f89421 SHA-1: 277787285d76255ab8667e480a9289762c261b74 SHA-256: bcb1cce16d02fe217bb8140d3c74ad957cb6c113b154732cc3aa0628cb4e39ef
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and embedded URLs suggest the PDF is designed to lure users to external malicious content, likely leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://rivaflo-south.in/userfiles/files/luwipubif.pdf In PDF document text
    • http://sapaelitehotel.com/webroot/img/files/91673483017.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/95696134226.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/womiwelikupojemi.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a8fe2d3bc---remanowiligixedoki.pdfIn PDF document text
    • https://kueapem.com/contents//files/xujidofogodininid.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/14356495230.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/17178206647.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a5de50e8b---giduleloxopiwuzetenili.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/ffd924a1511408031a3b891630d6fca5/2557021489.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/34917317504.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb72d0a02aa---subudininajikikawefanuvuj.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/jsblr1lbkpcamb6ljkn85aj6fm/57869957688.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/46089988764.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/ia7a0ffmk8ulmnek4msq8v2io2/25717808683.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/3577053446.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/bobomegi.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ec1022c59---16926244566.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/gejefibujagu.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/50625976415.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/repodam.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/25418544012.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/f9c4322dd4204c18abb37e73cce17c2e/xituzuzikufome.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084211e1f096---tigej.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/75069601930.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=m.ok.ru+film+izlePDF 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_off00014509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14509 23656 bytes
SHA-256: cff6aa1834c5852ae6bb888fba15a4a57888f36d6996ad32538a1f07e2d22fe5
font_01_sfnt_off00018089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000198a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198A0 10156 bytes
SHA-256: 20675e87fb4778f576cfbc071ae7208e12351aa726dc6619d7f8981cb6524cb0

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