Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c6b21ad217d6b34…

MALICIOUS

PDF

100.7 KB Created: 2021-06-28 09:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 072c9be0c1016a6576ad8b5fa894893c SHA-1: 65128f91cfd6c714d2cc88cef0442760da13fdca SHA-256: 3c6b21ad217d6b34f52378a5b9bb8bdb22d2d0730e1b040d79c5db6756ef119a
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many external URIs pointing to compromised WordPress sites and disposable hosting. This suggests the document's primary purpose is to redirect users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/jfmhauot57fpjdoe7ouihhuqs0/bafazujenamitoxi.pdf In PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/12327655780.pdfIn PDF document text
    • https://aashianarealty.com/file/jufonip.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c73e56e8614---99603775340.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/96373346838.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/jhk7080o820sdidu8d69u9cgud/jolijogigujote.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5ce8136c132f9f2b53854d3a1789f486/tiwadigawidowerotosuxe.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d39cbd60156---25039489665.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c86c458f80---36560406128.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/tojogumetu.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608feff3a4c78---33697138014.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/d7c8134dfabe0808a06821f92c948867/24653595979.pdfIn PDF document text
    • https://actor-conseil.com/files/file/wajirakabalo.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abae5436ef8---12000275505.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/dorowaxop.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9adcab892---2397415170.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608484d67eb3f---fonikatur.pdfIn PDF document text
    • https://elektrona.cz/files/file/samebero.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/22436346786.pdfIn PDF document text
    • http://sun-eko.eu/files/file/41366624820.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb07fd72a7---mufofexibataxevi.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/fodotajunisipet.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/10a316bf8e2aac914a5381f73fbb4741/nilogonilakirinavepodu.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/simuvosizifinedatasezet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=minute+writing+format+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_off000126bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BD 17668 bytes
SHA-256: 7f6d98ddbf55cfa7ce91e49c061d35801d6b56a3cede84c355d34b62a8c37fc1
font_01_sfnt_off00015509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15509 10804 bytes
SHA-256: 08423d30c081c4d61de8e80167a6035b7914c50f4d259bef0b07142f4974d8e4
font_02_sfnt_off00016dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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