Malicious PDF — malware analysis report

Static analysis result for SHA-256 03b454a7e8098607…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 04:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6617b31b81a102852ca05426ed4ed4b0 SHA-1: 4513339134acc809f31c04af8c9c189117fef175 SHA-256: 03b454a7e8098607a18b3d0a7e380e90c7780cf2c3629a7be34c68335241413a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to other PDF files hosted on compromised websites. The presence of embedded JavaScript and the ML classifier's high confidence score indicate malicious intent. The primary goal appears to be redirecting users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mtestbd.com/assets/uploads/files/34036954046.pdf In PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/174af14f0baea9458e1e51d373092cdf/xumezema.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb57b7f24a---joniserapotek.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/kapizoparogexovef.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/kesujid.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/diloxobeperodilasamaf.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/muwegesuzotu.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/13296003407.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/97635907.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/levig.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/koxufatejirut.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/38246767165.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/4978494293.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/94169643971.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/91041539406.pdfIn PDF document text
    • https://asken.as/bilder/file/tejidifefivegi.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/funujofakusotevajeladebof.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/xofukomow.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/benax.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/temegejalopetojof.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/bokejutiwifexopenoj.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/wezowunevasasasefo.pdfIn PDF document text
    • http://52963566.com/upload/file/202109180958305328.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/lfcf8ccd59fob34elhn935log5/3647104359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=horizontal+scroll+menu+androidPDF 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_off0000dcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF6 17972 bytes
SHA-256: 0271e36853046ca4e5eb3b6288489b2634b90c595cd577b6c9d9ae51aa8f3d98
font_01_sfnt_off00010afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFA 10680 bytes
SHA-256: 59de2e3f51d7246562fde3c41b1ebeea121afa7073223472abddbe48957d0352
font_02_sfnt_off00012378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12378 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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