Malicious PDF — malware analysis report

Static analysis result for SHA-256 3696b43ce35beb7c…

MALICIOUS

PDF

68.6 KB Created: 2021-09-17 16:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 071be59b54937ab7f5f4e081ec67280a SHA-1: deed31c25e292d729694624df5e030ea45228d3f SHA-256: 3696b43ce35beb7c3312cc3ff7f6800cae2d692c0a23263693593b8cec7a0255
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. ClamAV detection and ML classification confirm its malicious nature, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7082

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://cructi.ru/uplcv?utm_term=among+us+mod+menu+android PDF link annotation
    • http://quimicahj.com/admin/userfiles/userfiles/file/kosuxemasizebefuvelalepib.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/51399619679.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/78a2ee2fe2ff61266e94a40575be6da0/lifufavamekose.pdfIn PDF document text
    • http://serting.eu/userfiles/files/suguzoku.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/63388455339.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/bebezukawanerajikitosi.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/watovama.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/64345347030.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/74502826605.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/warejedirizasusanoxevaw.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/debutinig.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/zuverewulezatelutapo.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/71687716682.pdfIn PDF document text
    • https://dacola.com/upload/files/tigej.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351f286f9f7---zurusakezezabus.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/98209304694.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/27237025434.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/rekawikufe.pdfIn PDF document text
    • http://ccadl.com/files/20210911223629.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7238b1962---bofajum.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/ridulolip.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/78b330990a1e4d7fdc370304a0d0a29b/64593482027.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/bemolasemovir.pdfIn PDF document text
    • https://pecsikult.hu/files/file/99024352071.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/9361956422.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409071de9f2---33691848802.pdfIn PDF document text
    • 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_off0000d512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD512 18176 bytes
SHA-256: fe96dd268efa43c98bc5e45ba337d225906630112e234f32c6482ca252807b25

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