Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f93ab076ebbbf24…

MALICIOUS

PDF

87.9 KB Created: 2021-06-25 21:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5370f093dd94223de194e76475dd877c SHA-1: 3df25ba129bf0865392e3044f80c04ce077a1497 SHA-256: 5f93ab076ebbbf2442e1c22e746ca9b31858f2b702b93a497aa6ba0e5d0de037
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of links pointing to various websites, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to artificially inflate search engine rankings or distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/mlbo7pfetr2jn74ekkgrf9f67h/pinawavawisapu.pdf In PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608286c0d644a---41774401171.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607057fa68dff---50718626889.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/fe4865dc8d5c0a6476287f5b74de5258/96616358586.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/4ijp00svifiss6vgdlgv0tco0s/ramer.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16093e77f954d7---rivube.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16088a7283503d---15791168860.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/99f9f9c5cfd39266ea32ae8bbe71a74d/20232334961.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16200766197114.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/b04e2dd58cee4113acce87149fe37542/38986462237.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/wodage.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/60250581866.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792f324417b---16899957437.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dedc5a7c13---nedakekudamuxad.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc2c8855d5---91819582673.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/5c970bbfaf02998d8753d7c130e57ede/pepakabatewaxukupakib.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b7d58dedb---vogoporetepufiserezuju.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7898733f6---molov.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/gisom.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/4a58d3383cfdae61bf1ece781d5973a2/43279133988.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075991b393f5---zasewaro.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-8/20210508055110622342.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/64366164324.pdfIn PDF document text
    • http://kotolantopeni.cz/file/96072351790.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d356645ee5---39576579958.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0fb21966e---76036903059.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/18917185807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=steve+perry+greatest+hits+songsPDF 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_off0000f444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF444 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C56 17324 bytes
SHA-256: 5661611ec58eb40a895e375b8d4cc0ac3cf0d7fd1e5ed7a3928d3c68d98d670e
font_02_sfnt_off00013933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13933 10740 bytes
SHA-256: 475519339d7bc5f152af1bb0d090bca7ec35ff01b1012ea4c8c4775ccf3cd6c9