Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb879a72ed0c6cb3…

MALICIOUS

PDF

89.5 KB Created: 2021-09-22 12:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 064540ec1033e3d2a7285be2fd987c23 SHA-1: 013602bf9f41275804f9c35674c6f40d606de7e5 SHA-256: bb879a72ed0c6cb34eca43d6c12e0950d4158ff581322a8d7667696c4bdf42ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to various websites, many of which are identified as link farms on disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO abuse. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://rotitelor.com/contents/files/86430339999.pdf In PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312256ceade---vatowasunageputemevo.pdfIn PDF document text
    • https://pellevah.com/upload/files/62392249240.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/71769745863.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/93693479151.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/fasejakides.pdfIn PDF document text
    • http://donghotam.com/luutru/files/nowugiliwufopup.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/7d0036ff01231949fc2a1aed781e055f/77190590713.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/suxurobanijifezawan.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/1638207166.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/21008829421.pdfIn PDF document text
    • https://webrobogo.hu/kepek/wijibavatu.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/67722174169.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/kusunivuziru.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/7550000234.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pufipa.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613461c5ad8f9---75154055717.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210901052212.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/95227399175.pdfIn PDF document text
    • http://bochkari24.ru/pic/file/27314383487.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/3007730706.pdfIn PDF document text
    • https://dabanbep.tanglehadong.com/upload/files/62694019786.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/22834188678.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/ravewupesurap.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/wawuvomakuzapegulijofora.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/rulawafokozep.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/62026341212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=introduction+to+mathematical+statistics+and+its+applications+solutions+pdfPDF 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_off0000f379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF379 10936 bytes
SHA-256: fc0903ec7d51c18127e409caf0d8f357c6963d58b9fa4bc013e29565216c0798
font_01_sfnt_off00010c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B1 19376 bytes
SHA-256: 257e78b2bbeaf72096ad0ba379cc159d27ad993fd6dec7b8803924b06544bb64