Malicious PDF — malware analysis report

Static analysis result for SHA-256 7836029706b865eb…

MALICIOUS

PDF

83.5 KB Created: 2021-09-02 14:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4eac6a8f4e9a99137e7fd5669bd92613 SHA-1: e7c9889d395edb292ddb1f9dddaef9249f16e9b1 SHA-256: 7836029706b865eb0e27da509637aab47ad69390cf3987c03739bb800dbe1124
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=jaguar+xj40+workshop+manual+pdf PDF link annotation
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/d793a2ddfdceafdc3aabeac86fff292e/jixunijed.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608831959bced---11685554847.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e65746837---xenisobogakebegikasa.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/67396290323.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/991b1e9dc8e8aee5dc45da2140297070/baxugirubavolatepuduwas.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/zodimajizup.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160863ea23309e---23169961526.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/4u626c8a0n29v493dco8gcqm29/69822301690.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125c7a919cda---wabumefisikujasibe.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/gp99qjfoosnv2o7qamkj9cdnlk/50142464447.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609637988b4fd---30562903068.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ca50f1d635---54185899722.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/323508835.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/23322561832.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ajj1f8su65jnl16rmhubj3hngb/5499866458.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f15ed22568---4843955716.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/99346088180.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/669112568cb0cfa750dec5fbb8b22dac/lakexufawonapaviret.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/f504f6ef96fcea5d9813bf47931ef546/nodazadulonimugu.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/92598104900.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/15f99519a92b47232ff6c714fa5361f2/kozidagizivujawixepazob.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160b7933529adb---64121363132.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/308ef3e67d8ae053b752aa569db9641e/98347695572.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_off0000d93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93E 11324 bytes
SHA-256: f56315c88f9c2fa2aefccfbe7907de924fed9a4457550ab4481bd9cf1659b6ec
font_01_sfnt_off0000f397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF397 20008 bytes
SHA-256: 16669311343d2f1399469a7eb97f1d1a2549fc697f80e5d0258fb5a6126625c8
font_02_sfnt_off00012862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12862 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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