Malicious PDF — malware analysis report

Static analysis result for SHA-256 3827e00cd20b9ea4…

MALICIOUS

PDF

84.9 KB Created: 2021-08-15 16:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e6780c121ce235fc559f87499d85a8ec SHA-1: 463ccca9ffca67f3625ad504639dbe3eb724d546 SHA-256: 3827e00cd20b9ea48f0c79aef3551ee0c6344c1f20a4e9d1a30ebe0aa7354c8f
164 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various PDF files hosted on potentially compromised websites, likely as a lure to download further payloads. The presence of multiple links on disposable hosting and compromised CMS upload storage reinforces this phishing and malware distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://rgn2u.com/userfiles/files/72316899261.pdf In PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160851b3a034f6---74643251127.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/doregasileresukepegigali.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/koxug.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/j2q35ld3a9e4m1jjv1c321t4m0/pizilomesajijefebeturabi.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2edb3a8b1---14340155646.pdfIn PDF document text
    • http://vejwun.cz/images/44261590008.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/76185208317.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/68922fccc5f856b4b24ced9c0c86e80e/89431510052.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/45587499314.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/51780935539.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/db27161f963d649dfe4b92e1e9f09e7b/36053415051.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/63050043255.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/47919e7d1ad401595a10784d0a1c3b33/papef.pdfIn PDF document text
    • http://canadanur.com/resimler/files/42823544865.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd22530e46c---39592842761.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/97349380962.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839431a41a4---nalizodabuwubiburepa.pdfIn PDF document text
    • https://euro-commerce.bg/files/dusokivotagofidejokam.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/zisijabure.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b9921988a89---buweziz.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/20297829631.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607197d19d563---lagerumeziliza.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/tokuzoxiwises.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/22618107521.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/a4f6360a142985e1599cdfb81c2a1496/21786416321.pdfIn PDF document text
    • http://fullx.net/files/71192758287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=roguelike+adventures+and+dungeons+minecraftPDF 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_off0000e522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE522 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD34 17348 bytes
SHA-256: 10a6725c1a4f500f7500fd75491f4a17e3bd5cdd36289a3c15f70bcd2eec2c82
font_02_sfnt_off00012a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5E 11124 bytes
SHA-256: 275070ef6b5da2c764f48bea298d411d9a56c894b5c96053bdae6053d5dcb556

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