Malicious PDF — malware analysis report

Static analysis result for SHA-256 11cebfe8117f0f2e…

MALICIOUS

PDF

77.3 KB Created: 2021-09-01 18:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2b89f80e6d57a8361edfa73477ce30b2 SHA-1: 5622d7f5c495cbb072b6c8389e1cad2e9ab17a3c SHA-256: 11cebfe8117f0f2e2af0d24c3fac6d9fea1dea985e44c9e2c378c7b77f3ac32d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://smidgel.ru/uplcv?utm_term=tom+cat+and+jerry+mouse PDF link annotation
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/gm2m6fmlbvlm4la6jlcv12cjba/54186392881.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/33437483188.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210713182055.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/49697736582.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/bumopoxunun.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/161296e195d56d---zerifekulip.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/10224688786.pdfIn PDF document text
    • http://ed-union05.ru/files/file/gesofodanar.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/7462758817.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/loxegisaze.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/93532499513.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/xogebaju.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/50845242571.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/e16c1529cd43006b053ad4609a1b014f/18810494290.pdfIn PDF document text
    • http://theettiares.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/jifalufibubotipujupunupew.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/63326068923.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbf6ca6830---67503388271.pdfIn PDF document text
    • http://htwy.com/upload/file/koposasapo.pdfIn PDF document text
    • http://shepardfarm.com/clients/877021/File/85410206108.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e3200481b---lerolurazor.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/desomuxegamazivenavapav.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/66027350953.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082e51fd9688---24786854106.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/dfaf77e12740a0e5576b81e4d57e693e/zosujewirewuwiwonari.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_off0000c693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC693 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAA 10700 bytes
SHA-256: af4badbe5806da8ba628d50e6aeadec09ef771eab6ba7aa830ebca2782b33fd4
font_02_sfnt_off0000f749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF749 18264 bytes
SHA-256: 75a67095e420cfc2c12abbab29e477ed73a264c21e12e4b3050658250e872d80

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