Malicious PDF — malware analysis report

Static analysis result for SHA-256 f485cccf83dc1995…

MALICIOUS

PDF

87.6 KB Created: 2021-06-10 12:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0f64d71a8434853019e949ab3095f299 SHA-1: 191314121eb9819fcb31afc1f687f03295e6d214 SHA-256: f485cccf83dc1995467e0e6c7e2130d103c8c92456367cbf3e6cc7d600e92bda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://philabc.ru/uplcv?utm_term=messenger+anti+delete+messages PDF link annotation
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/suzuvosamozisavininabuban.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/b964b383f0e0beaa4c815ee97f883b1a/38144982584.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a88515ca9f3---wugufurigepo.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/tapelolexepefokaromiwarax.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/629a94f55b44b24a5d76d5552d035a17/67685696023.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071dd358d873---1687368940.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/dc6ab8a99a3b9dc9f28dd3f1d1cf6b77/tutezexe.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f60aaf1c74---bisunixu.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608253d90f6bf---fedifezuwejofel.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/fihvste8ntf8hk6mik13obg4l2/riwebomibafakajeneriku.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/337b01664a738590993e59eecd08c9ef/zerokarewugekob.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/2cb5e99a66afd913fe1889540a04566a/vijuvo.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160758ecca5e8f---dejukejepari.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0820aadd1---sedog.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16082c38cab3c2---salesuwoditoni.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/4cdjikhnl92ieivl4qnslvqrc7/6442676357.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75A 5148 bytes
SHA-256: b780f5bb6ba7a923af6eb2bf88e7b97ed6f11c3e70d779bd226eb7b30bfc8d64
font_01_sfnt_off000108ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CA 2328 bytes
SHA-256: 7b03edcf5aadc5f9e14c0df5c440834174a5be9dbf33448231549ca648ee1f62
font_02_sfnt_off0001134f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134F 10712 bytes
SHA-256: f5ca11b2d87bcc7ba2f48a9edcef313781848d9cc39bb79f75ecc430c5654231
font_03_sfnt_off000137ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137ED 17828 bytes
SHA-256: 47247270339d3d883a569a06d5267c1890b05193ee175251f1206b548a02320f

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