Malicious PDF — malware analysis report

Static analysis result for SHA-256 d094ec1bd7aa6b29…

MALICIOUS

PDF

70.7 KB Created: 2021-10-03 12:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 94f3ce70a46fcab6ddbcb3c11307b802 SHA-1: 4c3a1047adf584f407d926c34c5940e7159e90d6 SHA-256: d094ec1bd7aa6b29c181b2375db7c9ea15f79b6a868a61471dae202c80472fcf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or exploit vulnerabilities. The presence of multiple link farms on disposable or compromised hosting further supports a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/69592828508.pdf In PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16142384e66e74---22122674902.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/5e1cc9f075f2b0875b3c6299be0f7cec/sunidesogilopoba.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/96539766183.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/355c5ea6d8186aa2ebf2e7b7ee2d7823/nibunuvaje.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/6sck3mptj4s692sqhb7rd2g192/16301239368.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/xabusawimanizoxijakabub.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308fd2b7d75---pewidagigad.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/viviremefowadovasajeveru.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/kalomudugerosilivuva.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/karigulogidakitemuti.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/jolikibonajagapoxobabofa.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/vuludok.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/gelazu.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16151279facddc---72341711814.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/nuparojefimabenole.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/favewimedelin.pdfIn PDF document text
    • https://jagominum.com/contents/files/zupit.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/14965396254.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/96021324719.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/58808152536.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/zoxawufenonogodoj.pdfIn PDF document text
    • http://apcmagon.com/userfiles/65350445191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=main+cause+of+anemiaPDF 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_off0000b46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46A 16168 bytes
SHA-256: 2fc4d96d8239aa897d6d00d7d9f8c76bedb61a28be79a007c0b9b3d467028aed
font_01_sfnt_off0000ddb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB3 10344 bytes
SHA-256: f0b3001aa43cc76463df170d941ad702ec7ee641198c9aabc4886126c0e98190
font_02_sfnt_off0000f513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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