Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cdcff232da3d63a…

MALICIOUS

PDF

56.8 KB Created: 2021-09-16 15:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00282f87c4c6395e5565f399c2a1069b SHA-1: 94d345bab7a8321d8b887ddc6496b5888c4a013c SHA-256: 9cdcff232da3d63ab3e1da4dca8d20203668192f3582e71358f71d535de210d9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of links, many of which point to compromised WordPress sites and disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8091

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://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429b9185007---32952111493.pdf In PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/ramozenebal.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/24852396449.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c630e3b4f---tujufozidemuruboretomaja.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16134d1a8131ea---59753761257.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612edef7be5f4---disaropitamedalesabojo.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/21070857877.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/79126551930.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/78920374727.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/21108102402.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16137284bc2dec---zonufijuwoburakugoji.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/biziliwofatavewus.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/pabeniloragamorodadaraju.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/76802626651.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/29607216452.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/22288570809.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/72529218696.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/21207444400.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/tuwibajukegekirosusol.pdfIn PDF document text
    • https://andhimazhai.com/images/files/95217149532.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/mimazojezafonubasiwebulo.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/91045884794.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=seeking+arrangements+apkPDF 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_off0000c57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57A 10596 bytes
SHA-256: 5bf23348f962d9b86bf2e18fccb649234902cded6db1db1cf6be2e31f44e4ef5

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