Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d2ef919ecd37e9…

MALICIOUS

PDF

79.5 KB Created: 2021-07-23 19:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f5544e3ca963b6d298b6c78dbaf3826c SHA-1: d0c0de8fa477f6b23a3fa237a4b7cda410695e6e SHA-256: 81d2ef919ecd37e9be99151ec3fadaabcc2802e4bdad05d32fd2557eab1e595c
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm hosted on compromised CMS uploads suggests an attempt to deliver a second-stage payload or redirect users to a phishing site. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' further suggests that the document may be part of a multi-stage attack involving password-protected archives.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.santaterezinha.com.br/js/ckfinder/userfiles/files/mejuzitewigudusenebakuwiw.pdf In PDF document text
    • http://idcla.net/upload/files/bibekojidejuwumedab.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/toviwojaxupodusalisobapel.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/92cb88bf6359f92b135ff3ebb6da9454/dazakozinoj.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/ed5f2801e9d8408e714b67ea82c8e1a5/serikasimoj.pdfIn PDF document text
    • http://honda-vo.com/upload/file/nazaboxevub.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/donijozoris.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/48389700260.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/vekubisakafomapak.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a587858350---73278003115.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/goledexusonobazixipalesel.pdfIn PDF document text
    • http://thepdaitruongphat.com/upload/ck/files/siten.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160869597788b0---89399078341.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/sofuz.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rozajutisapod.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607065c510529---32224944948.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/lotafiteb.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/fepunedelulizi.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160731155350fa---155092825.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/2761786206.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/bajidurekupoz.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/filavimavakufuzolodiz.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087202be153f---71013582568.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/82988753184.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/e5b869efb22bbc942c4e8da2170a8d2d/lusalenamawitonikezup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=mec%C3%A1nica+de+materiales+hibbeler+8+edici%C3%B3n+libro+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_off0000cd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55F 11544 bytes
SHA-256: abf762557ad192e8bad5764b68f769c9142708f39f3a92365f71169a64b3407d
font_02_sfnt_off0000ff9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9C 17704 bytes
SHA-256: 9968218bcc819b3ac49a29abb9f09e776634661412dad9af3a2bd55960dda8a8

Open this report in the interactive analyzer, or submit your own file for analysis.