Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce79c5b51e97ea2b…

MALICIOUS

PDF

76.4 KB Created: 2021-09-06 20:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d3c105dce1f081e3abf4e8b7a6aa12ce SHA-1: b871e8a6359f7fa7bdf7ca450993f9d0ab2dbd0c SHA-256: ce79c5b51e97ea2b6d8cfc43d8eec4540e7b641e4a31335faf014feb9a375814
164 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload directories. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is a link farm on disposable hosting, likely intended to redirect users to malicious content or downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://drafthe.ru/uplcv?utm_term=raj+comics+online+pdf+free+download PDF link annotation
    • https://tectrongim.com/uploads/files/litedumuk.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/37540420282.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/166d36f018080caa9bd5d2646722dea2/wekujexoxuzosavidotugi.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/kuvexedosotudowifuxoba.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/52226643710.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/287413993.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607165edbcc8a---16118797671.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/42169227237.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/177qp2j3a6kh8q94vutgoeoeld/55834934936.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef053a2ef2---tisixijuxifof.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/wuxediru.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/m0huo8mku1a7mhc13chmdsq8e4/vivuwokitodabasevifotidos.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/lifutali.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/zadabufogovunuvuxusaregaz.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/06/45084529164.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/11018531858.pdfIn PDF document text
    • http://grupophi.es/uploads/files/lekejewezivu.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/9639207648.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/woxizabadexupinu.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/93030078840.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/38894392918.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/dibaliwa.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a230350da0---7399873929.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/25352636071.pdfIn PDF document text
    • http://parentini.it/userfiles/files/rumuzewowasaba.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/gazapilefasipita.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/85068463936.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/59688718721.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_off0000c64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64A 10944 bytes
SHA-256: 2c3d9e714920cf5ed7de592f964df5d6c20d3ba646d5cd247c852d2feceab70c
font_01_sfnt_off0000dfa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA6 16940 bytes
SHA-256: a5794da9167abe63bafb66036f22e635ef7f4710bbee36c5fc4b308d8b0bef38
font_02_sfnt_off00010b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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