Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8915c6265a72e83…

MALICIOUS

PDF

102.3 KB Created: 2021-06-26 09:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9dd366f5505b908e87f3a7035d68d1a3 SHA-1: acdfdc96d5a6b39c3ee48e085727f05247bf3688 SHA-256: e8915c6265a72e83662aca9e3099283ee6410fe422d0294ba1e2f7212696805e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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 https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/9ce850d743c6e65989827846cfff5c1f/3257373708.pdf
    • https://autotrans911.com/thread/admin/uploads/file/42659755398.pdf
    • http://andrelandberg.com/userfiles/file/besogofepotesasoz.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/e3c902dc5f4c84114ef1af7f7934caac/47953063463.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/nukepeti.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a92a0549c53---rojunibamipepikutelu.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/33bb2fc0264309865337bd7aa60f94e0/kufivibukijijuxabibowenef.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f71d6215f0---zuxinejosejamabutukesub.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072e1c72e6a6---xekisad.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/3ffd61b3934c4a54304d02587912a076/20939200071.pdf
    • http://614move.com/clients/4890/File/86315746762.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608566d572858---kobufof.pdf
    • https://burgas-remonti.com/userfiles/file/95140738739.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/527562952c635d9619668e8765b8b644/lagapolupatoloxutem.pdf
    • https://creativitagh.com/pevron/www/img/file/34013554679.pdf
    • https://rmp-traueranzeigen.de/cms/files/11750394785.pdf
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/tiwobevumoxoguzigo.pdf
    • https://riolospettacoli.it/filesUploads/file/70179061332.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/f5da3d68a8d89398344305da095b32f1/62043597217.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95a7da7a0d---wisasitije.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/kkf149vetk710a13ns85dmgp2g/47532078849.pdf
    • http://hocikto.info/userfiles/file/gonekaxosazinalek.pdf
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/21992332322.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a50ab61c6f34fcac1cceafec6885aaf2/pibajaregaxaxokab.pdf
    • http://bkbflooringusa.com/userfile/abbey/file/tiwelosof.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=where+can+you+mine+sand+in+hypixel+skyblock
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e5f.bin
935baca9fca534708a4466e739562d18273d078d25807033555b68d64d5c4fda
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5F 17236 bytes
font_01_sfnt_off00012816.bin
5680c8bd5ddef791e1ec73142f868473b626d8c0a115e14b3eb85f80c23b9eb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x12816 18052 bytes
font_02_sfnt_off0001573c.bin
b7f00adbffed7fb14bc38ee7077e006b9d7e7ccc1a9f25231deff12a5627b0e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1573C 11220 bytes
font_03_sfnt_off0001711c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1711C 16792 bytes