Malicious PDF — malware analysis report

Static analysis result for SHA-256 474bfdf88b795c07…

MALICIOUS

PDF

85.5 KB Created: 2021-09-04 01:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a9ad92b7bf8176312c2c7a9eca7839c6 SHA-1: 3f9793ff2f78e0a4be23cc09501aff1e6ee51a6b SHA-256: 474bfdf88b795c07fd84e93f3cdc1544f19b2978de3d3c9f620fc92be7ca4e96
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users through compromised websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://clinicscrm.com/img/files/90245195908.pdf In PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/59830734560.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/82f699038ec0f95399119b6c62296662/totupakebegizogekijemepe.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d51bc6dad1---zolikusoluxukafavevam.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/xudepex.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2141cee606---pitirupato.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/bugeveketo.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21230c1ac6---bekarevo.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/b9493f8b8479c9a2317b35a5bb08f305/guledosamakedageroki.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/47c13079dcf92925d9c2edc5afb3534f/45529559507.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd19a9bfab1---29886416488.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ccb67c452---98068225376.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/51087747933.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/jerobofemoxifakojazuma.pdfIn PDF document text
    • http://atek-ent.com/upload/file/84077059337.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929b5963763---rumumimexok.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/dd719e2c97fce97053185cd7c447f507/23217366627.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/a4f00fa59a2d11e5f93f7f2342b7a5a3/soloderikora.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210831065621.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/0ed2c9e8ae8e0ca1f87e8be9b34c0df5/90852194630.pdfIn PDF document text
    • https://blokhol.com/upload/files/kosirif.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9e5cuqhj6js06hocijtjrfhc80/bujodazesadexabezu.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/56369336008.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/felimowewezatevodajalud.pdfIn PDF document text
    • https://midasspa.com/ckfinder/userfiles/files/80949491721.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/68569880563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=wireless+doorbell+kit+user+manualPDF 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_off0000e742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE742 10732 bytes
SHA-256: f33dae5dcc9481668a4a55f784365b27b6878ebdf89333fe5794a13833927280
font_01_sfnt_off0000ffec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEC 18452 bytes
SHA-256: cba04b2c92b06e96ea1612ffd0f08064065d7dd4b26bee52a1a43b8f9358a2c9
font_02_sfnt_off00012fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1