Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2f81389bcd6a2c…

MALICIOUS

PDF

77.6 KB Created: 2021-07-07 10:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6308ae38945791269b48321f9537e73e SHA-1: eb2ca75723c025ddd58c6815767daecf4c774408 SHA-256: 4f2f81389bcd6a2cbc87ce52d4a1d59bbda11fe1be7bb66a8e21c9cfa53e44a4
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, forming a link farm. ClamAV identified this as a phishing trojan, suggesting the links are intended to lead users to malicious sites for credential harvesting or further malware delivery. The document body is unreadable, but the heuristic findings strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=how+to+share+pdf+on+instagram
    • https://gloriouz.in/ckfinder/userfiles/files/refame.pdf
    • http://vietthanhstone.com/images/news/file/duwaxupalotenuxe.pdf
    • http://hockeydh.com/files/ups/files/juzid.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf2e2ba9d2---dugivirekokep.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/k6g407711cpdu8n9rt9dvjl451/golem.pdf
    • https://dehayemek.net/upload/ckfinder/files/7796162889.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e24c223a33---68085759910.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/97rkpk3j8o2r3vmuvgpeuf5qc1/vivilinapopodap.pdf
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59060302902.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/0181e45920808463d633452d29253b2d/bexofaj.pdf
    • http://palletgoanloi.com/img-dn/files/33569350091.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab66c099a51---zozev.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094453e109ac---48760074485.pdf
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bec5088fd8b---lujubesivinaxu.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/cf661c4c9546e14eb6475d930b9c67b9/90144373685.pdf
    • http://bigpictureresources.com/userfilesbigpicture/file/93981241927.pdf
    • https://betalinktech.com/blmedia/file/24477604712.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/bismala3m32989jdgbb3vkorfh/dukadujopasepalel.pdf
    • http://murielbellhomes.com/userfiles/files/barejif.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a33372258e---vunatazid.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d0aaa3a31---63314542518.pdf
    • https://ubk-sad.de/azubi/userfiles/files/83254351182.pdf
    • http://decamiones.com/userfiles/file/15810890100.pdf
    • https://granchefpremiumfood.it/file/nopefigaripegazemenifovu.pdf
    • http://wojno-stal.pl/pliki/file/jufosuzawuvuzu.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9d8.bin
02a1645813f762fb86bd9f6a8bc7d27beb41feab6cfdbea321a603937026df56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D8 16760 bytes
font_01_sfnt_off00011579.bin
f559add8d6fc01302b42de450765c9cc9cb9408ada77ee59e4a0c88dc340bd54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11579 16136 bytes

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