Malicious PDF — malware analysis report

Static analysis result for SHA-256 5090edd744aa27e1…

MALICIOUS

PDF

92.9 KB Created: 2021-07-22 07:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a3d87942ce026e24bc39c0167c98b742 SHA-1: 53965c058e7fcf8a36ff8abd6bfb523af1f354a0 SHA-256: 5090edd744aa27e18a68ae1a3280be477a015708ac17f2a676821bc32384c928
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c629769ece14cbe85512591cb0cdd99f/60917498409.pdf In PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/30gs0gcur1riuq4btm1osdnoo4/pililu.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c694f671e93---wuvodibozimafabesu.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/jivabidi.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eccce58cae---kazizomukazopedolosam.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/sobewil.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/fididimugefexa.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/55357336539.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16092982d98a0c---34803353225.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90125758f2---sazajujiva.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/zadofiselapo.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160adb5aec388a---jixesejutezasijixit.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0ifkojq7a3dk0alilnbdmafu12/rodufinijakojuzez.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/97d9c7d93ccffbc5f08a9d5548902d67/66124832044.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb67742793---vidodavux.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/gajupafoxiruti.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021072023104673499.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/20da51608c0d16e62f087b8e0657f423/sapexunerimekezikenumag.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/xexenuja.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094211521865---gigovemegizunekezoxu.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80ba8bea36---28528317162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=what+is+urbanization+in+sociologyPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/4dfcf8bb3a4cd3764a8af4fe6e66c08b/79193036027.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_off00010793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10793 17068 bytes
SHA-256: e9f370c8d822fd28a1ab8f5a1b04e6d56464f5a816538d89ce07bafa931eae2f
font_01_sfnt_off000133cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CB 10784 bytes
SHA-256: 00011d80413924e5ffeb9d4dbf9b8078b27b9217ad9d831dd0ef38a9f4e6a427
font_02_sfnt_off00014cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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