Malicious PDF — malware analysis report

Static analysis result for SHA-256 21208843e9127c1e…

MALICIOUS

PDF

69.8 KB Created: 2021-09-24 22:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 44f7e8363ea6425a1c79314d026c6764 SHA-1: 33effe828a3e4453d1bb28e7b5150dda9cda171e SHA-256: 21208843e9127c1e6f4b7f2552dce4a70cded523ad8b30a76663b8f5a15b49fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://irlanc.ru/uplcv?utm_term=install+usb+loader+gx PDF link annotation
    • http://omeofest.eu/userfiles/files/xulutixovalujas.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/topewogimukuxobu.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/vijaxajoreve.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/fubemejo.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614d7409e2e1f---14854178400.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/23f819fe303766dd1d02aa200cb3a9ee/zometekupitikuvurasib.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/15202300367.pdfIn PDF document text
    • http://kunbot.com/upload/files/36613562553.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109232146502415.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/megeposibokik.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/duxefaba.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/lonat.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/mozebifivikivo.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/buwulujelib.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/renolodonadosoxutup.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/bukipexasotovivenol.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/17669580569.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/12334854890.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a6fd2a893---23644352148.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210917102619.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/likaderef.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/35761742536.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_off0000b02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02D 10624 bytes
SHA-256: 25d1fa0ac96fc00738a4161ad97eec9492c3904a6bf2eb3bc1d449c48694d72f
font_01_sfnt_off0000c873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC873 16104 bytes
SHA-256: 00988404603df989bd467553ef471cf164ce51edf3f6c07ab96d7fcddeca41df
font_02_sfnt_off0000f198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF198 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1