Malicious PDF — malware analysis report

Static analysis result for SHA-256 32587b76437c50b8…

MALICIOUS

PDF

76.3 KB Created: 2021-09-03 18:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9feed82d2effd43d2fbc48cef4e2f36f SHA-1: 87077662952e74823666fd705710695eea1ac0c4 SHA-256: 32587b76437c50b853d2d704820739da95a31b1d57c9f707f5d24056dd0ddde3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious content. It also features a link farm pointing to various external PDF files hosted on potentially compromised or disposable domains. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://vtdsbinhthuan.vn/public/uploads/userfiles/file/tagesaxibit.pdf In PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/paxexexasijelogusudaj.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/tuwugezunozesugosap.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/51473857736.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/35458675654.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/35850372602.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa41fd03f5---14531079849.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/b8f8b645f7de36199df02a5fea1de31d/51202455246.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/4c9231f37255990547136ccaa2bd4961/tageluwi.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/bitivazip.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c335d66eb48---51145494706.pdfIn PDF document text
    • http://briarcliff70.com/clients/874901/File/pijeta.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/77754143170.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/16430901801.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/fajutorenorinobu.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/acmh1b7nro5quolv3p0i72871d/98550637004.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/gitinizudurizobit.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/9fb54240f889dee8fac10f38d746348c/23043654839.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/161233d50f413b---62973456688.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/a04e0c214914a9de3533cbbd7629ee52/44499330921.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcc3a8ef0a---mitafezifawezutubevopub.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/13951574016.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/xuvukutuxenup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=embed+multiple+pdf+files+in+htmlPDF 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_off0000c80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80C 10604 bytes
SHA-256: 805860f2abf7789ff079c6515e4a04cf14f0ec47d7414791f5be6bd346ea370a
font_01_sfnt_off0000dfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC7 16868 bytes
SHA-256: 347e8cebb6ab6b4abd9dd27004b492686c31cd9aec52a509ae671808771841a2
font_02_sfnt_off00010b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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