Malicious PDF — malware analysis report

Static analysis result for SHA-256 a260c35987a2144f…

MALICIOUS

PDF

56.7 KB Created: 2021-08-28 17:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 128a6d8f4e5e8f2820f19ec51781e96f SHA-1: c1bb65045a49b2a7e4298db7dd22ff383ba043d8 SHA-256: a260c35987a2144f71977a94d68561028417d47b9ffa1d28029ef203353ad851
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to other PDF files hosted on various websites. Several heuristics indicate this is a link farm, with some links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9596

Heuristics 5

  • 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
  • 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://suativisamsungtaihanoi.net/upload/files/wuxarudenuzeruw.pdf In PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/93172417169.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/viripavibolezalavu.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/39763828796.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/damemotanilotolek.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/25820111127.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/rawibepakimutaxoruwisaj.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a96cac7f4e---82634964650.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/1527901845.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/ruwagarilijaxefuvubajesa.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba57fe5bee2---18472982971.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/90110454693.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/64447c1956eed7db0d992c7ebf29a090/77066397207.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/sifonawugapefenubabasuj.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16084c901d9515---29851519450.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/rebux.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/0c554120e91106a3587f5fc46ad34e5a/87135184156.pdfIn PDF document text
    • https://yodobashi-church.com/45286361310.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/14933273450.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/4754718908.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f139300b18---23859283516.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/32089403132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=name+the+ions+present+in+kclPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA73 15856 bytes
SHA-256: 062529ea64467d7a5a3fd9539f45f69fefcad6e7d4fae61e97d2b8ea063b8720

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