Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d5dda3dec3200b…

MALICIOUS

PDF

74.5 KB Created: 2021-09-14 08:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6feb56e278f26d0d3710208198cb4d04 SHA-1: fe347710d74f220bebfd5132301be0f74ebe074b SHA-256: f3d5dda3dec3200be1b4f8328640bc73095bba2eb1cc7aee6dc32831de26fddf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to compromised websites such as 'modelkyujin.com' and 'yepuco.com'. These sites likely host phishing lures or serve as downloaders for further malicious payloads, aligning with the 'Spearphishing Attachment' and 'Exploitation for Client Execution' MITRE ATT&CK techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://yepuco.com/uploads/files/97721532233.pdf In PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/13726264542.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132532a0bc5a---kizejuwamo.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/bifedidupusejikoginedoj.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/59476437202.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2c2d43ddf---sinanizar.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/59621320221.pdfIn PDF document text
    • http://packamate.com/userfiles/78057362712.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/80393868222.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/21712722229.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613214016d63d---4658912070.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/27672809989.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/vulifilafixisoxif.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/8138778912.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161363d02e1776---ruxowarolebe.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210913185226782788ggy97.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/juxivuwojozinubane.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/fumemuwuregibeleguf.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/57065053951.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/45d1ba4ff48bed0a6ab783bc3fa3298c/gesegojujedotevijej.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/31625435051.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/71984794462.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/kipominemozigupo.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/gulipawitomagizarovozik.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/66318548562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=coco+free+full+movie+englishPDF 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_off0000bc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9E 10720 bytes
SHA-256: 909a284ac92aeb7f4812cbd948c40b44814c33ae86c83ce36178c014694ce91b
font_01_sfnt_off0000d509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD509 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 18288 bytes
SHA-256: 7a18d15a3fbe499ca345e4c385046abd51c2a3e263584bddcf2999075501d4f3

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