Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53c404543455ad3…

MALICIOUS

PDF

78.7 KB Created: 2021-09-22 10:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c9d581cf77240f4a3d3744398b757e6f SHA-1: be17061ba7fd1303aa7232996ea91e03383bfe99 SHA-256: a53c404543455ad370d85d763d1643e1a4cc280568f45062168c0bd287024537
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to compromised CMS uploads and disposable domains, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support this assessment, flagging the file as a phishing trojan. No scripts were extracted, but the document structure itself is designed to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://amgaa.org/temp/files/rupusajajomomelifu.pdf In PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/96962742849.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109100806123811.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/bozufebuzanut.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/bilulabiginuw.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/fb29b188b06dc91f472af2fc2267f9a7/bepel.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a092c8e6c1cacc2b9fca4b321aaf1df/75463128687.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/21774996705.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/61006964902.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/47332c1207d9c72402433ebc903d3b24/18248246060.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143da971105b---tijalurijib.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/fogapi.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16134fd5804916---dedugexuwov.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/35277426942.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/9746298146.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/tofibogoxuxis.pdfIn PDF document text
    • http://muaklekcoop.com/downloadfile/File/rijokafuluxojemoxosomofif.pdfIn PDF document text
    • https://windsbs.biz/files/file/fefawavamuwopi.pdfIn PDF document text
    • http://didopack.com/files/17223650773.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16135743d9db68---11548518969.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/78114123676.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/digawisami.pdfIn PDF document text
    • http://linker-apps.com/files/87097234995.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/53056509450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=bnha+season+5+episode+5PDF 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_off0000c76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76C 21020 bytes
SHA-256: a6c86adfdc5e6173aa6ae220123b225e0d40ade8f83e775aa88a1772f93669cf
font_01_sfnt_off0000fdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF6 10432 bytes
SHA-256: 2fd8685c612d05ca1e2a7c4350d07f83e22795f23020eceb3dd2e6ace948832a
font_02_sfnt_off00011594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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