Malicious PDF — malware analysis report

Static analysis result for SHA-256 a002deff04b58256…

MALICIOUS

PDF

79.4 KB Created: 2021-09-06 08:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 82edfaae5ffdef7146e6520d6392d46f SHA-1: e9419bb06d18807f190b1cfbfae897368ec96627 SHA-256: a002deff04b58256f531de87fca2d492be6f83eb19ef4a61c5597b81aca3cfb7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload storage and other disposable hosting sites. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised or disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/sg5j7rk73cofpjj0nqmldkivh5/56216128541.pdf In PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/23880041618.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/kalukapep.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d04372210d.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160926dae8ac10---mifupijetuxebitakoxalas.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90717bba6---96168703163.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-13/20210513213613589342.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160ed950e5228f---71824277566.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/0i2ehpdr5n4c619up0hi772hm6/pulorofurimibiligaxe.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d5120b011bd---jutebatavenumunemadejek.pdfIn PDF document text
    • http://www.asslar.de/downloads/danirobinakawasopovipafi.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/72575206453.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/15476303488.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2386e3a468---76791025773.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210809152737995111bcnge3.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c78afdb3e1f---jadebawove.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/sulufirabidenidodanu.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d50ca620aa---18754972364.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/xawajesikuti.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/fizoforusubaret.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/xixupaf.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/sorit.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/48286212590.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/k9enfmu67a4cm7a1pe8nroqpg5/21328578035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=gst+composition+scheme+rules+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_off0000d333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD333 10864 bytes
SHA-256: b2af3573c417e66cc16b033539d67784c4ca5383beb4bbc90fb65c9ff9bf703f
font_01_sfnt_off0000ec0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0D 16988 bytes
SHA-256: 27f466ab56a9b00c8a0e8527a5f7a930e64a39cb37f461db32fbeee562bf72b3
font_02_sfnt_off000117f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1