Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae6e2391c1222441…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 03:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b9a5a933df327b79d2350301726f8d1c SHA-1: a055766893b4927d913a04aa78bd25532950bf65 SHA-256: ae6e2391c1222441af24010218bc4bbdf979e8b5bfedc8bf0242614d7b15b1fc
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, such as the one hosted on kystop.com, are key indicators of this redirection behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161422d5f51812---lamisedez.pdf In PDF document text
    • http://xszhuhai.com/uploadfiles/files/86009151860.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/jalevudures.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/55336625883.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/degifolijelujekuk.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/63160195088.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210905124909.pdfIn PDF document text
    • http://unsersohn.ch/images/file/57050445811.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/4245bfda4143e67f4fbc12b16df9ed2c/27410537649.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/mafotuzuxoniwufivobiwipep.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-5/20210905170522678453.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/mezilulisise.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/towopu.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/poxexa.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/23031524836.pdfIn PDF document text
    • http://abwrva.com/uploads/files/lupowuxukuvovefoxojane.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138f9bd07177---wakawisajabesegujuriwe.pdfIn PDF document text
    • https://vientangluc.com/upload/files/malujerumi.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/70868513695.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/jowotezebifenukimarefexip.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/wakamabawitafixijinesida.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16145bd6bb58fe---watadareporinalubagudug.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091602293473499.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210911_FEE480CAE3343399.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/sifogamozubogox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=free+music+player+no+adsPDF 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_off0000e00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00A 10768 bytes
SHA-256: c52ac1d5c4fa7a9d12e1b7ce1b994c4d56600a9602da89f97be91380d9c407d6
font_01_sfnt_off0000f8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C0 16840 bytes
SHA-256: ab690b9f923b47d5f6e8a7c53f1a5657c839e80f0cb838e7f8bbc8b9242bbc2e
font_02_sfnt_off0001243b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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