Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d94190fc060481…

MALICIOUS

PDF

92.6 KB Created: 2021-09-04 15:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 54a2bbbee8758fdc5ef2d790e744e9a5 SHA-1: 1ce5e8e3858faba0a90f09d5c78b8c451713e666 SHA-256: c4d94190fc060481e4b9b966ad2f24052ca52fe705f8c758db9f809ad71e5768
156 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://thepokewave.com/uploads/files/kimataxofavebenabadagovat.pdf In PDF document text
    • http://n-production.com/upload/fckeditor/file/49174626865.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/xapepabaxufu.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/77108155236.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/12879293254.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/sefibolunibaxemifixoluz.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/aqh5f0ueg80t1se72ql3l4knd6/77819097467.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/71410405018.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16087240df2fae---63898230870.pdfIn PDF document text
    • https://beautydent.hu/editor_up/zogazulojimofu.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/wowotudonokinomepugibu.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161087cbaa0da1---27158147059.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/41634555132.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/fogapiwujute.pdfIn PDF document text
    • http://jcpingie.be/public/files/xugesofijawabatozufipaw.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3303db6b31---13640835370.pdfIn PDF document text
    • https://tebra.si/userfiles/file/rixenukulizunegojepa.pdfIn PDF document text
    • http://darienhigh70.com/clients/878490/File/fuwezaxanorivenadosiwamo.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/8d1vkd86hlrbtf7mmaam4vf841/miziv.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/20256476344.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/2426250762.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/do3n3le5kcsndu9bk0daglimr8/70767987097.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/sewenesarimadosumukekuk.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/952ee791214910dcfce0597ed5a19d0e/teriduzabezig.pdfIn PDF document text
    • http://sodrex.pl/userfiles/file/99514212670.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/33329435884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=hadith+with+urdu+translation+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_off0000fe60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE60 20924 bytes
SHA-256: b6e849c660b33148a04ccf8f940447807e44b55f21becdcc9760b476df51adf8
font_01_sfnt_off00013495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13495 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CAC 10640 bytes
SHA-256: 8de580c4d746c930f5510ff9f7e36fb011f5d33db0eb7c9597ed57894370e453

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