Malicious PDF — malware analysis report

Static analysis result for SHA-256 b630663182a8d656…

MALICIOUS

PDF

91.3 KB Created: 2021-08-15 05:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 377613030c47b51dcbac56d3eaf031f2 SHA-1: fc1f2f9c4f4816f7fef091a4f80edd0a5e745fca SHA-256: b630663182a8d656a57fcd5dbb26e1bf6c7d950d79eff873ccf1e42c6fd41e1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kayapaliinsaat.net/file/xazosexibaw.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2aa3d8d09---kokevuxogozipavo.pdf
    • http://kleinschadenexpert.com/userfiles/file/miguxuzej.pdf
    • https://foundryindia.org/userfiles/file/vivumuveragedunevosumaku.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc90fa77a6---doxudutuja.pdf
    • http://pekingtogo.com/uploads/files/44987807300.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/n9huo8kov5sj89cni2ckpk3846/zelusakab.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/76c8ea1fffe5b9298d7b14ebce14f139/96480464132.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab639b54090---63629579859.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/gqnro0rnvev83pgqt2rkfpfue7/26756828081.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b42d60c2bf7---95736292721.pdf
    • http://siembra.me/uploads/files/85802905991.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e330aa44f38---48864369675.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d20bd1f267---61300475011.pdf
    • http://ccsup.co.th/uploads/ckfinder/files/73006989862.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd3a3727a87---lokonodovemevebajalufuku.pdf
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/jisenumuw.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/74fffdcc8670ac4bb717967a504fa42a/53772433392.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a692626627---92467394617.pdf
    • https://baigiangtoanhoc.com/upload/files/ludopewep.pdf
    • http://doks-films.com/pcms/content/file/vomit.pdf
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/48119730875.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5440512a85---9012222393.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/a53efd1abff01da4d89b8fa3bdd43db8/84399235915.pdf
    • http://willbramephotography.com/44396836056.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=kovaak+aim+trainer+fortnite+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off0001073e.bin
a695d71554098244c12f9056cf2f3fa32e1e3b1463de592ad91c32f20416da26
pdf-font-stream PDF embedded font (sfnt) at offset 0x1073E 16900 bytes
font_01_sfnt_off00013355.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13355 16792 bytes
font_02_sfnt_off00014b6c.bin
2dad36497dc36a4a228856d3781b05070b93a5776caee6c84aa98055e07ec844
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B6C 10312 bytes