Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fece3d76db39b4a…

MALICIOUS

PDF

71.7 KB Created: 2021-09-02 19:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8ae0820b5d7d5ac7e52127b8b70233e5 SHA-1: 8ce1ce95424cead99db00d8ef1b1fb6136b9ca98 SHA-256: 8fece3d76db39b4a8ea717176dc3bfe54c57bc5f881e67dba5ae78291a72ff16
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple PDF link farm heuristics further supports the attack pattern of luring users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://hijaulumut.com/contents//files/17768799687.pdf In PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/9ec9fc4e04eee8ad45451d86a91b7edc/xifoma.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/43339632465.pdfIn PDF document text
    • http://bptramptour.pl/files/file/rekoxogarib.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/sedefelefusufob.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/budazegonokutirigetanope.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607666e7247cc---gesezijon.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5bc1b8a96---30214536961.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/gufumedasaredadaj.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/uffb0n1n6j9qk0tljino0s6je8/dirarivenofiwavob.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/4tm6061obb4ntac5p4760u35ua/47858273486.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/pe4942brsqf314c5o6p3nbbi0p/61680622233.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/dateruram.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/tiverodegokagexonisukufa.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073bef9dac05---jinefapumoweranavem.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/mewoparaxaxi.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ae1b1a67e4d7c5d60fdaec47904048a5/86787111753.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/53616507283.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202107251043267422.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/93206118098.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/161051aff9dd90---wazogaleper.pdfIn PDF document text
    • http://kuzfarm.ru/images/file/33671107196.pdfIn PDF document text
    • https://lesura.net/userfiles/file/47749428895.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/1g0c14232jk76gd12uq2q3aura/babug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=operating+system+by+galvin+6th+edition+pdfPDF 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_off0000b7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC1 11460 bytes
SHA-256: 73091804214abe34533c02556c80b6a4c3cc36ab1b1380b3fb08934d4ac822c5
font_02_sfnt_off0000ea49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA49 15316 bytes
SHA-256: 4e57e2050afa7111afea05ce16bcde972c7a12c03d738af15d548a99a32f4f6b

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