Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c71eef4ece79ad…

MALICIOUS

PDF

77.9 KB Created: 2021-09-05 16:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ef6df1a486f925d1b8688dda37100a8c SHA-1: 9750c2ae41659c513af4a9fcd74fd323ca569637 SHA-256: e7c71eef4ece79ad8e04b29e7f2aa92d41be39530a1f7013a152edca59a42139
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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 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://twfbs.com/ckfinder/userfiles/files/legusizegufafakijisuvoj.pdf In PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/275db71436c5194b5434ecc005c23a56/bozuxul.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/15074441235.pdfIn PDF document text
    • https://bunianco.com/other_files/File/53103706068.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb1d2db1fb---5710362350.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/kevebibiki.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/drmm42c81hb1fsvtu33t2tmvdd/dojekuke.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/nqj9jmf3n6lp45koks73vlpj31/25240589426.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/fijenenizasosuximuwokum.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/71634565229.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/zoredafod.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/28401682406.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/62604929738.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/genorox.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/duban.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4313b1f36---vosafovizuxejupabisasales.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/520ae8ca76cb8ba1ba08c0208dc052c9/muzudogosafowato.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/87367503974.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/nrsgkvpi4jvm8gq8hfgjlel3nu/nurutuwejiromunivu.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/jatokilepimo.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1611d4f18e7aa9---26740173164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=troy+bilt+lawn+mower+manual+downloadPDF 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_off0000cefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFD 10644 bytes
SHA-256: 912e40ddf3b701b588cfb26eaf209d6c871825819802a14a2d65f502a53fe1d4
font_01_sfnt_off0000e757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE757 16752 bytes
SHA-256: f7ed0895465c3ec27a6942b4b96718385692f5c4a9ed4e2537962bc339a5205a
font_02_sfnt_off0001127e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1