Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b575cc8094ff84a…

MALICIOUS

PDF

78.1 KB Created: 2021-09-01 21:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 25a03bdb986a34a98a758511d14358fe SHA-1: b45a54e1620ca7f4e5153f32d60ff3a341b30a9b SHA-256: 0b575cc8094ff84a7a3d0c200733276f53ed3e5438d2e1134365291658624ea5
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and a compromised CMS upload link further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5550

Heuristics 5

  • 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
  • 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://allytemp.ru/uplcv?utm_term=gastrointestinal+disease+symptoms+and+treatment PDF link annotation
    • http://texinpack.com/uploadfile/file///2021073005332295.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/fepolilugifaz.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/t8j8v72hopakukbemdeeurcbo5/rikavaxubobexewixij.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/08/26/file/pujobutibudufe.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/zagubukojuzigo.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/eb67f83beafa8563d33807bce3d27bac/fofono.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbcf541115---28226179101.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/danuputa.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842a6744d77---41822907223.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0730b469---bagesifarodil.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/78333956546.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/74924033172.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/5de8ff522312de068443dc9474ab7bac/nixebolafujewekileredaxeb.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/setezumuse.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/n4cn3r0h2man4feh7t9snqmk36/89549206317.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/75200846210.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/69863552806.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/orren7j0o4b73ho5i9ucmtviog/50666555410.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/94940137789.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/eqmmg1ua7qv9e5jqp2j2p7s3bi/86360178483.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adf96427365---jozonijezezi.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fa222b2842---93673260533.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/konowozexad.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b759a77f9ef---revuzuponekirewiz.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/12379115060.pdfIn PDF document text
    • http://btfa.tw/upload/files/padegexedipoviwiwemam.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b3faeecc1---lisebajivofa.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C81 10708 bytes
SHA-256: 4c53a1a58a5229321718822f2636c9ac5489e5fdbc8888a9eb818421a4919e0e