Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5d757aa6f823b5…

MALICIOUS

PDF

72.2 KB Created: 2021-09-23 11:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b5169d6943f44a2f73705c2bfd9318b8 SHA-1: 8fef823b0b2ec70e49fa737c3c78d26406999eee SHA-256: cd5d757aa6f823b592610f9a76b46cef04b158887cb8ca8699dad50c252c5868
124 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection and heuristic firings indicate this PDF is designed to lure users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, and the document body was unreadable, but the URL structure strongly suggests a malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4393

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://huntic.ru/uplcv?utm_term=sync+google+calendar+in+android PDF link annotation
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161417badb874e---97749365398.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/xilexafogo.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/fumepuzudozox.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/sifelepikuvajabetegenufab.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/moxusetawa.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/28370244239.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1c2bb002c---vewujeleser.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/8tgukcc7k4dd493ieqd3ipbdqn/2017468574.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/19777152644.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/22922285847.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/bogegumumigexirijodakew.pdfIn PDF document text
    • http://zuche0551.com/upload/file/botisexilububifabiwanufud.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/87852287541.pdfIn PDF document text
    • http://guchen.ru/d/files/8680872041.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/49644627906.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/noxasanifizexiw.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/figenubaxalifipijedaruma.pdfIn PDF document text
    • http://sireny.net/share/files/271954085.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb01643b42---29240353053.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/cf3560f37495d93e2b38c7e19d48faa5/57719423148.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/18360287116.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16134a03e44017---8266632041.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/kesodesemozaninenozi.pdfIn PDF document text
    • http://kalikraft.com/images/file/wibuwodatar.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_off0000dedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDB 10468 bytes
SHA-256: b23b7180047e23b35a57bcf45d8648de760fac30c0be4356d3eb3909bdf87950
font_01_sfnt_off0000f68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1