Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c2ab4e78e866f8…

MALICIOUS

PDF

69.5 KB Created: 2021-09-21 22:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d752099ce8e63659b469cb443c92ed6b SHA-1: 1a293c3412d273fd592159f70427bf49bc879027 SHA-256: d6c2ab4e78e866f8a1097642c393d79f389de66e7df64d893e813de84f006d58
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2573

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.
  • 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
  • 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://synerhu.ru/uplcv?utm_term=1+cm+graph+paper+pdf PDF link annotation
    • https://www.renouer-auxerre.com/ckfinder/userfiles/files/22230551928.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135615533367---zisuwuwerezofugodebalane.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/v2uu4rqgh5klfr7e69sb8vgqm4/1715489176.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/migibitegabupotobubufado.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/6751003560.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/posujosiledojo.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc548bef5f---ridufixamanuxisodego.pdfIn PDF document text
    • https://mmtours.si/uploads/ripememitab.pdfIn PDF document text
    • http://aweibel.com/Photo/file/vasegomojajajewumad.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613efb5905170---33359033634.pdfIn PDF document text
    • http://dr-temt.ru/images/file/53723445712.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/sasumoxopixebonov.pdfIn PDF document text
    • https://siroyensao.com/upload/files/12847376074.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109152055205135.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136e70dd5125---sapojetimetiw.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210911110622452737immji8.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/xogemufepezutonimogetiko.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/56960612434.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/79845858949.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/vutasisulivefug.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/40231315892.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/jolezurezosewovod.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/50510289884.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/71643422964.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/tizejimugalelinosux.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/kikavetejijafogupigisuwe.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC603 17708 bytes
SHA-256: 05ff8596fbcc0ed246f05fb3933419d445403d934206e1bf975ed14912e4f071
font_01_sfnt_off0000f43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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