Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab13a59952d90e8…

MALICIOUS

PDF

87.1 KB Created: 2021-09-16 17:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebbe0f9e01ae79750147cd5973fca0fa SHA-1: 99e9e81db0738488d0a7a1e2b37984233f94e8cc SHA-256: cab13a59952d90e83c06a85bce39cbea738f842e9a9d5c5e67c6fd669fa41d35
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://elmaga.lt/components/com_mijoshop/opencart/image/data/files/rimukuganutijekezumu.pdf
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/bajafisevesom.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161343ade3c9bf---guvulonopisiwori.pdf
    • http://worldtile.net/jangheung/userfiles/file/82292416947.pdf
    • http://automyjka.pl/automyjka.pl/userfiles/file/79122198931.pdf
    • http://petgears.com/app/webroot/files/file/30316278129.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132817a024ad---wisasonovopiladunup.pdf
    • https://theelementrama9.com/userfiles/files/gojaxuwezovuben.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613123859ab8a---88474702507.pdf
    • http://stacjaregeneracja.pl/userfiles/file/rivukadopobugujusitoz.pdf
    • https://ismart99.net/upload/files/fuwujaxo.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/203a76fe55238d7a6b1a148a66851191/maver.pdf
    • https://susta.vn/userfiles/file/xipixiladux.pdf
    • https://www.casestilistas.es/ckfinder/userfiles/files/1820736514.pdf
    • http://talcmanagement.com/uploaded_files/userfiles/files/64546784995.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/2f383f75c93a19dda3c974baf7c9124d/lafunedinasibodineluwoxez.pdf
    • https://bestcaps99.com/ckfinder/userfiles/files/15211112993.pdf
    • http://boschvietnam.com/files/usersfiles/files/gexoratulogodu.pdf
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2963633629.pdf
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/xifivusikovorumiwalenewok.pdf
    • https://curvy.tw/upload/files/xurejomo.pdf
    • http://broadgatecapital.com/userfiles/file/43525877241.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613203e9f00a8---31128068386.pdf
    • http://ugrctrani.it/userfiles/files/danobejifebesaxovu.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/70d2a714c9dd7ce6c871223814bb8c15/miwuvelizugawemuxu.pdf
    • http://martonaroniskola.net/userfiles/file/13189971553.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=fear+the+walking+online
    • 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_off0000f158.bin
dc59897832948a3f447787c7a1615c98508b95351a6f1c89dac8fcee13956ec1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF158 10372 bytes
font_01_sfnt_off000108c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108C2 16792 bytes
font_02_sfnt_off000120d4.bin
44c5fafe40256958eae1bd6a471b9510a2484de47aa4ac852516fb0bec296050
pdf-font-stream PDF embedded font (sfnt) at offset 0x120D4 17648 bytes