Malicious PDF — malware analysis report

Static analysis result for SHA-256 3534b9e6eefd04f9…

MALICIOUS

PDF

72.1 KB Created: 2021-09-17 09:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f1b76cfe2ce090c22b0d84f1b9c110d4 SHA-1: 97f2b458586e6612466641314b13286492327aa6 SHA-256: 3534b9e6eefd04f9fa0a05e5b498ab70b9a3b07966cf48e7375e640648507b36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=turbo+flight+simulator+mod+apk PDF link annotation
    • http://sacoorhealth.pt/site/upload/file/29583522964.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/31151780940.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/labizovujoxekaxo.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/34140108653.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/59835623828.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/94234772613.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/vatunogaw.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/tigetiponugogibajan.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/wudigosevevu.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/tuziveso.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/37023499814.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/guzevajeba.pdfIn PDF document text
    • http://arucax.am/user_images/file/5482869755.pdfIn PDF document text
    • https://andhimazhai.com/images/files/simojolide.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/36675896959.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/fodisebamoz.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/44917267123.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/94ba180fd6ff9af154c7ef5a833d64ee/pinopibonubazejexivetabaf.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/12846917801.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/dofopusesozikokelumob.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/39393894091.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/42b4eaaf90d6f9ab5ed7102ec1b4e74a/filaxebaxativesexorugox.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/h3adli12m28krr3ehj0uifal3q/31482305543.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/xovesapabufo.pdfIn PDF document text
    • http://yjccnc.com/upload/files/36053338787.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16141177775d31---sunotejukoso.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_off0000b93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB93F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD156 11004 bytes
SHA-256: f8909fc41063321a7be8de6f97dabfa6c994e35bf553794e281c4608bb21cb86
font_02_sfnt_off0000ea74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA74 15756 bytes
SHA-256: 46f80800b1cdf41cb68ce9e61c5c99962f9946031e07d050495c290b5e177288

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