Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7998451fb141cf5…

MALICIOUS

PDF

79.6 KB Created: 2021-07-03 04:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a71ee5427293b8a689a917d7761cdabc SHA-1: 584c3d156dfc6e6bda6e5b16bcd03902818f14f4 SHA-256: c7998451fb141cf530536264529ce9c12dbef54f1af1a8fe32b435d7c0b42b45
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites. These links likely serve to redirect users to malicious payloads or phishing sites, a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/d80a4250117370bd25e62abd34cd3bc8/99132782107.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608b317706868---35310315420.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f032b715f5---dekekamenabupitirevifaveb.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/i6m3tqqt3ksresfm9b453511d4/ditimamabogirenamuvukan.pdf
    • http://anthonyellisonfamilyreunion.com/clients/f/ff/ff850d76676c1858bf5e443b7a907d3b/File/digazepafagin.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/4da2e099916a85d43cf304750d253912/xonafodunuwumebu.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160807cd4a2dc9---40228972858.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087e72c63d77---riletebimazexaliwora.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/qhdoc4atfslloobf2d80rt31f2/3941358703.pdf
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/pixewalotarupifo.pdf
    • http://aweibel.com/Photo/file/jorujoraguda.pdf
    • https://systematix.pl/userfiles/file/febojukojuzere.pdf
    • https://rocksoliddesigns.biz/userfiles/file/sojiwoxavapotegur.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608abc4dcaa66---wonopixarura.pdf
    • https://fundreamz.com/ckfinder/userfiles/files/76706906161.pdf
    • http://herve-coiffure.ci/files/28977310666.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/0g5uduem5edp4kli1tq10nmph0/97307144670.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/a464e041e7daf40c3ad7cd34fc5d226a/11058344739.pdf
    • http://cathugo.de/res/wysiwyg/file/nakukogadesewosobaxojidu.pdf
    • https://loctra.net/userfiles/file/28161580448.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b255d473c40---devimozijefigip.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608af6a0ea308---96976306379.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16072e144163e8---96979325035.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad700d996e---5174045143.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=automobile+electrical+and+electronic+systems
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ed1f212f3b0733d51a8b11e314f84ebe/99126647004.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_off0000d792.bin
63e7825ff44f2e431eae33312e109227c4b8d86895531618f1debe0ae3054ca6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD792 10868 bytes
font_01_sfnt_off0000f0af.bin
efb82de97c6e18ee35591d2d82fda6dd1d039ea30a8d54123ac8aa845dedbeb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AF 15632 bytes
font_02_sfnt_off00011895.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11895 16792 bytes

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