Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ed0e39581c00e4…

MALICIOUS

PDF

86.0 KB Created: 2021-06-27 08:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81e2693d17fd7edb733f8d44df8d265f SHA-1: 0a4dfd2e930a93837d102b07a5450320246e116e SHA-256: c3ed0e39581c00e41038e3fcb11e6d92cac757b67fe945598740e914e97a8368
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm hosted on compromised WordPress sites, likely designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of numerous unknown URLs pointing to potentially compromised infrastructure supports a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a075d07b3b---60824095429.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/7c59375aae9feaf12c2b17446fe3b91d/78121401375.pdf
    • https://nhadatonline24h.com/Images_upload/files/besavema.pdf
    • http://vervesimuhub.com/userfiles/file/38086346508.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/xomijizu.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/j7api497srhevbe0002am6b859/kaxerisewuloruledumel.pdf
    • http://duszek-lasu.pl/userfiles/file/menozixowidelejeforul.pdf
    • https://robertbah.si/files/file/rapixevusovopuwikar.pdf
    • http://yoron.net/up/files/52051553019.pdf
    • https://sanidom.pl/img/file/xenedomekotimigez.pdf
    • http://jshtextile.com/UserFiles/file///62559148332.pdf
    • http://originalcheck.it/public/img_admin/file///zezepemuwujomuvabozesedi.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cb06d0302---78331676950.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160881a3fbf458---36319609471.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/17b36ce5ad54acbec4184858f36ad68f/62511667805.pdf
    • https://muguet.fr/sites/default/files/file/33191634780.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b0f8abe10---bolawazuzevozanasozem.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608df362bbddc---pusigojakuko.pdf
    • http://vmkmsz.hu/userfiles/file/gumar.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071b02b41c2f---vamixizafomek.pdf
    • http://ac-kenigsberg.ru/files/file/46243896930.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c93026bf16b---kerojik.pdf
    • http://aranykoronakft.hu/userfiles/file/golozizabi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=bosom+meaning+in+tagalog
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2d0.bin
8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D0 16060 bytes
font_01_sfnt_off0000e7df.bin
3935ca9a6b60d647bf80134e2fc2eaca7a73e570a60b5aa6b490dc27b9ed515a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DF 19732 bytes
font_02_sfnt_off00011abc.bin
7b4e2f75648ef8c4a86b94ec460689334305a3816e0aee14fbdd758c400c2350
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABC 10404 bytes
font_03_sfnt_off00013252.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13252 16792 bytes