Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d2c0377a40bac2b…

MALICIOUS

PDF

87.1 KB Created: 2021-09-20 12:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e4a617ada9ed9a02e2b39223192d75c4 SHA-1: a9e779b6599544c67e51b2d3958150a163dce5a0 SHA-256: 8d2c0377a40bac2b9ab723c45bc264e7098f975a8f2044e96e4be5569b5123e5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of a link farm pointing to multiple domains, some of which are hosted on compromised WordPress sites, further indicates a malicious intent, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://yasaitogo.com/uploads/files/73660360994.pdf In PDF document text
    • https://shioturboapi4-xyz.com/contents/files/16694484540.pdfIn PDF document text
    • http://www.polni.si/Images/files/35274888006.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/78917612787.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/sutovexijerilafa.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/ac36d66ebc5866d3cce1f2df4dded06e/lewirokesox.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/97557392035.pdfIn PDF document text
    • https://basisnomor.com/contents/files/jolosinovo.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/vivonomamakefalajo.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/fogujupobibakuxixi.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/gewimu.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/41660744384.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/jitugulaxam.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/25887076493.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/9173347135.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/gufezawisedixuguzasovesen.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/sawavowoxonokutepiraluwo.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/razoxofetiterodegag.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/57571689717.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/80c10df29d4e0f6e4553d80d0cbc8386/fajinovajima.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210903020113_274089928.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/divajinibazogox.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/zofivofibixukojo.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447c3dcdfcf---41238068728.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=name+the+noble+gas+in+period+2PDF 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_off0000ee4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4C 11076 bytes
SHA-256: dcfd77fc29212f82db1e2aaf9ecfa220d17c31f7b9ca64f8d07110ff089db78c
font_01_sfnt_off00010781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10781 18204 bytes
SHA-256: 778ea310fa2c9c9ad15d7b96bb81863b2478b3e70e987103d4a62281f6afdc50
font_02_sfnt_off000136e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1