Malicious PDF — malware analysis report

Static analysis result for SHA-256 2649d0441aed24b8…

MALICIOUS

PDF

68.4 KB Created: 2021-09-13 17:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 39abbf18e69603cd96add24c45180aa9 SHA-1: be58b8f96c3d4c4d76217332c4156d44ed2951a4 SHA-256: 2649d0441aed24b8bbb222ce0666b5443e778b1f44f357973075e6549d2e5300
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised WordPress upload directories. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be directing users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://wastran.ru/uplcv?utm_term=how+do+i+download+podcasts+to+my+android PDF link annotation
    • https://mb-classic-service.de/userfiles/file/81662749733.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/9adbaf1c557b4a58b6af4e920fc3becd/39714463985.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/wodumub.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/44905720428.pdfIn PDF document text
    • http://talesma.com/E/file/457478244.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e73572bc9---63939418283.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/nozumiboteriweponidireked.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/26065611379.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613870a291fff---86049335022.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/toxogejuku.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/64ij3v23iane9faf68spbr4ae5/pivez.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/vivopurinopadadovak.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/57837702713.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/xowapugilepogafobikiv.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/8619853760.pdfIn PDF document text
    • http://yepuco.com/uploads/files/28385134523.pdfIn PDF document text
    • http://17njl.com/userfiles/files/273127260.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/d452f7661533dc3b60e4d6d615c5b66c/gegupojemileduzofavub.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/17900921115.pdfIn PDF document text
    • http://rc-modeller.se/images/file///mirepedalewoguronalagigum.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/82406e277544bdfb7d2b9bde887a938a/59136863726.pdfIn PDF document text
    • 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_off0000afc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC6 10732 bytes
SHA-256: d8b4234381c54eb92b8a9c61531bc33835d97779679c60104bfc16fe392f0526
font_01_sfnt_off0000c865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC865 14420 bytes
SHA-256: 7fc3b61eeceb7797e31b668610b59dae9d6e8d5e7051a4965532bc87c6838e4e
font_02_sfnt_off0000ebec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1