Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe5fe0344a2f45e…

MALICIOUS

PDF

80.3 KB Created: 2021-06-26 23:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a09b40dc1d3bbf8b35f884ef10ea0a7d SHA-1: 0fac866e6ecfab6f3ea93b5d89aa88689eff0724 SHA-256: 1fe5fe0344a2f45edf1acab8f02215bfa812ff6e9b815b1b0086ed2c5ca26414
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://caratow.eu/userfiles/file/dudixaxapeluforipos.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946857578db---regibasikalopokapo.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/6b8af4baea2ff1cd9d60d83126404935/56422600984.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c880fae6f9c---76999842535.pdf
    • http://agcslohian.com/userfiles/file/8440521815.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f5a913c4f---39880512236.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16070f87e9c7fe---92303193636.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/db807073e7c9e01d3768a0eb00ea879a/latenivemi.pdf
    • https://estoniapools.com/contents//files/49563451663.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/rr7n8dn4i7r1v6kni5icnjslu1/8122934126.pdf
    • http://elesud.it/img_pagine/file/fegojakagowalenixunoguri.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a01ff40d3---96263801026.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/b47a481325050a0856f02192c11f0fc0/gedevazejim.pdf
    • https://xn--80afc2apd5n.xn--j1amh/upload/files/65975220882.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/dc8i1q27gik1t3b0k2hvinicii/99823832612.pdf
    • http://bigxra.com/uploadfile/file/2021052100481873499.pdf
    • http://imssp.by/data/images/fxeditor/file/16209614570.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/06c3c8eb8c9c396a6cf360d179e0a599/12184343310.pdf
    • https://bestofbucerias.com/upload/file/29114543684.pdf
    • http://dichvu12h.net/userfiles/file/7127979963.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d45eb1d4b---karevos.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb546931f4e---86674741553.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cae94764e7---52533890555.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=quick+seed+germination
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • 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_off0000d66b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD66B 16792 bytes
font_01_sfnt_off0000ee7d.bin
04a4345b6de62599c636928989e50b7013b6328d46b97e2ac5fd441e59084e35
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7D 17120 bytes
font_02_sfnt_off00011b18.bin
5172bd8706b1df12c920aee3e59db890497e8dab4aa97c56f4ae9f55e73fa450
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B18 10916 bytes