Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb4fad83ac1b9db…

MALICIOUS

PDF

79.7 KB Created: 2021-06-19 13:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 38e756295b17d6a67a8857175c593553 SHA-1: 194f581af85b2d18b0f5b4e1cd383b58c0bd4c92 SHA-256: 3eb4fad83ac1b9dbcef5c0a75c555ff119e8f888d0f3dda2138adbc7096b228d
154 Risk Score

Malware Insights

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

The PDF document contains a link farm directing users to multiple compromised websites, many of which host other PDF files. This behavior is indicative of a phishing or malware distribution scheme. The ClamAV detection and ML classifier further support its malicious nature, suggesting it is used to deliver a payload or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8981

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 http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a10830d2c2---wutobesolizexew.pdf In PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/2cb5e99a66afd913fe1889540a04566a/vijuvo.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/nimaki.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffbbedcd3b---37813369794.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/g8qb32a7iukti5snnqfe29oha1/nugipatibefexexugibiledel.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/85687411517.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/95745743203.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c0b91f237---gulit.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/49936744913.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a376d9682d2---19498952398.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/vifizedata.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/27338319308.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/ce7d5e47f51b5cb873a770bc92e266a8/91492272431.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082113c72562---59021208156.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=active+and+passive+voice+in+present+continuous+tensePDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAA 5084 bytes
SHA-256: b6944745346e2dcfdc3ed58354821e70c8f96e318c476d891853564cad0cf355
font_01_sfnt_off0000f007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF007 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off0000fb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6A 10380 bytes
SHA-256: e2aa2b0b398d2dd1a0e55cdc82db466c3acf5b1ce6058151573007bc078f7ef5
font_03_sfnt_off00011f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F16 11224 bytes
SHA-256: d7079ba1f86105e81ff8ed5f21f0dbc491ab9fbb4a614fd73cc8330af37b25c7

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