Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92f72e39fb0e8ee…

MALICIOUS

PDF

78.8 KB Created: 2021-09-06 04:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4115e6681d57015dbfe95a5b5cfde1b8 SHA-1: 4977b97006fb45111051e6f8d6d36f6a356d2bc3 SHA-256: b92f72e39fb0e8ee3000a8ac44eda48b403b2e06458e8d8b0cb682da12e742d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://irlanc.ru/uplcv?utm_term=uniformly+accelerated+motion+model+worksheet+1+answer+key PDF link annotation
    • http://precedent.by/_newsite/images_from_html_editor/file/jubuzilorivoredovudapof.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/keluxogep.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606f606de2554---nuxegafopigiwomuraxutigaj.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/kegonixefodariga.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/rovubokinididi.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/fimulagulavosutili.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/degaligezubexowesojasi.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efff3dec80---81604887024.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097535e29d9f---13291946083.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/5426610132.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9ca135da8---dimilupedasifaduxukewi.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/23335148657.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/biputudokad.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/nakodetukid.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/kesidodorikepogesitogi.pdfIn PDF document text
    • https://polaria.cz/images/file/92124707233.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210607073113105.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/31701803398.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/1kublni15bi5r830bmhefsv444/39366976662.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a924ef19b30---84570380266.pdfIn PDF document text
    • http://arablift.net/userfiles/file/11913691826.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/8a0b4e48efaf75127b4af8b051a328ba/zetidasererijesuvo.pdfIn PDF document text
    • http://englishkan.net/UserFiles/File/81929502037.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_off0000c544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC544 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5B 11092 bytes
SHA-256: 4a2704f55e958e916f7570881d7c3e4e1a3c0a2229753f3453eb9e7ad92813fa
font_02_sfnt_off0000f726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF726 19752 bytes
SHA-256: da4bbd26285f29efb99651ce4d7a3c6991a369c99ceb02a5868f64065a213295

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