Malicious PDF — malware analysis report

Static analysis result for SHA-256 239a36478bc188ab…

MALICIOUS

PDF

79.5 KB Created: 2021-10-12 14:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 34790ed792313ff347a15ce9f558c97d SHA-1: 8f681a2c50e5bc54c777254e1aec2edbe4bbcb55 SHA-256: 239a36478bc188abc501b520e8647b1f1f31200a3ecfa90b0faaefa4242a6a2b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an attempt to obscure the final destination. The presence of embedded JavaScript and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content to analyze.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://cructi.ru/uplcv?utm_term=bharat+insecticides+limited PDF link annotation
    • http://nanoservice.sk/upload/file/73844174871.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/86244510780.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/24088260125.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/kadesalodanamupulinurigix.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/69916474073.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/zaxofawofidunujovavixa.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/tojupusanugale.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/zekijolawefaxanij.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/37203038645.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/70360653228.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613596cd7ee0f---47417761855.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021092418521373499.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/gobofulem.pdfIn PDF document text
    • https://anup.bo/images/files/30917530509.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/76039262856.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614ca5b36fc12---37966398235.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///wuzabuditivuteki.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/76s47oqlsbl8ho8sfsblhrssc4/mamiwumijonopuf.pdfIn PDF document text
    • https://petribax.com/userfiles/file/xasexafepunawej.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/25019961615.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/lawoxe.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/79348706617.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/xizaridebame.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1615cfbc4ccda1---45982941076.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_off0000ce37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64E 10568 bytes
SHA-256: a807832c7340ec5974c2a300b53bd3dc0ea197abcfcaa06252d14d281f7ffe24
font_02_sfnt_off0000fe38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE38 19044 bytes
SHA-256: d4590de3a51a2c776613b42df6f880f9ebbe69a6b4ef56a0d983ab8e54b886b9

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