Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f06673a4b7e3a2a…

MALICIOUS

PDF

91.6 KB Created: 2021-07-07 15:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9d0675b53ae5d055dba6b7f432910f1 SHA-1: 4b2a62edc22443e2f5ad827c42130cf3c711d9a5 SHA-256: 3f06673a4b7e3a2a003eee0757e8d45b82f5f94d6cd0752caac78420feee8e56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised CMS uploads or hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 http://brainbond.ro/userfiles/file/jifanokerofuwa.pdf
    • http://yournamebadges.com/withyourdog/cms_uploads/file/25079812875.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f2af05f5a---lemibekegeji.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/cea2b189c14ffacfc46909de7a208c02/56107659991.pdf
    • https://avgdesign.com/userfiles/file/62092009527.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/0908b5eb6b5ab249232816384369e000/komeburudorupubewofu.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/1676115b2c32fc6f3a52567d71fb32a9/fulomubesi.pdf
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/juzotonuxuxagur.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b082d97f1a9---birilavutimotumesumudedix.pdf
    • http://suamayin.biz/userfiles/file/xusewanijakipevosevufu.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/1b5ae315463cb738d7e7807ea2c77cef/16511714943.pdf
    • http://chrisdepanneservices.fr/Sites/cds/files/lezalarumonesilamiwaxo.pdf
    • http://burfel.ru/upfiles/files/1798562817.pdf
    • http://a-kamen.com/userfiles/file/29497773232.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/ce7mekh96cvs7m1c254h5qp7k3/ragazufudibupalad.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/b3436a14eceb1b5e462c2dd6c98e29e6/dufufusenijenepogono.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0e65e3d91---vixutofimibikesipagive.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a218e7791---55333007529.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/55caecf3d95bed71cc4fa1538e1831a2/31247330457.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c7a699557---sugibebebilemutu.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c74933fe7a---nesimupadubata.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ab89fba6c38d72ad79fbdc48941b8516/bukega.pdf
    • https://drrajanmahtani.com/userfiles/files/pojarukepotofemo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+find+k+from+a+first+order+graph
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607505a2a55cf---32497332463.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001001d.bin
527bf0ee16a8900f71f35cc27b252bc452d22e600842fd988d69499c62f3dd2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1001D 17892 bytes
font_01_sfnt_off00012fb5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB5 16792 bytes
font_02_sfnt_off000147cc.bin
086057d6b737169d1b544e845993af3f6543bfa2f1a72ff8d00977fabd455786
pdf-font-stream PDF embedded font (sfnt) at offset 0x147CC 11068 bytes