Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b3834026d95c0d…

MALICIOUS

PDF

80.5 KB Created: 2021-09-15 23:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e306acbc1ce003cf024d582a756f5fee SHA-1: 69fbb13c2b45200bc9bd836e2524e1259fa212cb SHA-256: 05b3834026d95c0d5f322d0f18c88664dffb2add544b0fd7f9078e4d7a963ae4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites via a spearphishing attachment. The file's structure as a link farm on potentially untrusted hosting supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=fonelab+for+android+safe PDF link annotation
    • https://vico-real-estate.com/ckfinder/userfiles/files/93397570477.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2e7714d9b---78199264660.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/rodunozanapo.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391272bf1f8---80564231251.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/fakutoduzulowejomijutor.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/2083909096.pdfIn PDF document text
    • http://minerva-collection.net/files/files/97248002227.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/ec2729da4d0be7d7844bf2caab9ef04b/36882698710.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613222b230331---55462164682.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/75715603117.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/71369359362.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/10938546060.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/63233815088.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee32abd803---43950759515.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/bokewanidusijunigiz.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219101736392319.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/bajotemosatudenupesebo.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/95662456682.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kijodunufabuvunukuwirep.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/razavewikabobejeledudo.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/70280052545.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/mifeliz.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/87536793887.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/zugemepuxivinosaz.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_off0000d7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F0 10368 bytes
SHA-256: 7b64272fa0c791debbf4e116ad9b25919e1639852b8f831e9d068b0695b2c4ce
font_01_sfnt_off0000ef62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF62 17540 bytes
SHA-256: 816616b95eb7e533bb54b25f6e568af29c2611e382d6725835d9dd4a1695c8cb
font_02_sfnt_off00011c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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