Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c071c1a4544eed…

MALICIOUS

PDF

69.8 KB Created: 2021-09-20 22:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3d5355e57e87e2c6dcd754245080af7a SHA-1: 447dcca0e435d1bafe95f0b8e3f033eb46954ead SHA-256: 54c071c1a4544eed851eeff6d68e3d5698a00110afa574e163a71581b1eb9076
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to disposable hosting or compromised CMS uploads, suggesting a link farm designed to distribute malware. The presence of a high ML score and ClamAV detection for 'Pdf.Phishing.Trojan' further supports malicious intent. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://zhongjiukeji.com/upload_fck/file/2021-9-3/20210903041659867075.pdf In PDF document text
    • http://chinasoftcore.com/userfiles/file///92229458456.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090611524493.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/38114705331.pdfIn PDF document text
    • https://davaocarrental.com/images/file/90944887383.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/pafamujukinuwol.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/tenudedasetu.pdfIn PDF document text
    • http://kasand.com/userfiles/gakegow.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/zuvigivobu.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161444c2cb91ba---jipojuduvaramaferimafugi.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614740dae2f5a---mexisojagojajeje.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c48c0454ded53fc9fd8a419b0a4ed69c/83533412363.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/59941831740.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/af0382c4bf3b802bdcffd300c27e399d/dutukuf.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021091804283173499.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/24863686982.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/1120103551.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/26173053912.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/89659868523.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/11301669126.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/vataju.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ede9b96763---39349080755.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/29404612953.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109140516512200.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=minecraft+pocket+edition+download+apk+1.17PDF 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_off0000b37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37E 14556 bytes
SHA-256: 999d189485c1d1a37b659f1bbb2bd0ffd23fef7e383da1784e74277355b097de
font_01_sfnt_off0000d7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEE 10784 bytes
SHA-256: 6036e7f5ea91e76aa843c451caab1a9512fe746d994b89821153a439b0eac0f3

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