Malicious PDF — malware analysis report

Static analysis result for SHA-256 86503a93f0ff43c9…

MALICIOUS

PDF

90.8 KB Created: 2021-09-05 17:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67f0b695cd98e2ca4c0cb0c57373503f SHA-1: aafead08473b8e6c4464a5b513156fd080381eac SHA-256: 86503a93f0ff43c9f1742672ece2d61479c991626bc5fd09f36650a72e1cb2f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/835942a1c738ae5919b0f2a64c202186/48442091605.pdf
    • http://tv-kitchen.ru/files/files/64317331724.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16092b6f7155bd---77382407828.pdf
    • http://lorichphoto.com/pictures/file/jomaxenupi.pdf
    • http://giovanninociti.com/userfiles/files/48177300574.pdf
    • http://suacona.com/clients/16856/File/ronotuwagufibunanelajoja.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/1861be9e4d34722ed7d21b61d55e824b/romufupupiwipuzesemolamow.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/cjdln3akvhsvvgsll03hmbs4o4/77240620078.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16100aa6814061---xubidawapisiwetimo.pdf
    • http://pmmagic.vn/userfiles/file/40514396088.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1611c0134111df---91079483023.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f3473d9f5933fcfbde9506871712427a/revijoxizabogedelileva.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/9v66667m9a3acnsv93ebkcvjdi/midudamazep.pdf
    • https://ajitcoatings.com/uploads/gejofigasabelekupawin.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/592ac4fbf3f52126493d5c1f191f00c0/52186237397.pdf
    • http://jandebruijn.com/uploadimages/files/nagexuvija.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/0c2e907102f7ef15238d47f0c3e501dc/nozexemubeponatetugano.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c9653f5e6c5---21668809046.pdf
    • http://achilleferolla.it/userfiles/files/jenixujuwutimejew.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6236f0c7df---xebupa.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c001bc7e1b05933e30d281c313c6bf9a/99061897972.pdf
    • https://igruppe.no/ckfinder/userfiles//files/63975235489.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=linear+power+supplies+pdf
    • 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_off0000fe9a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9A 16792 bytes
font_01_sfnt_off000116ac.bin
490c5aff7f136d40b89e1ec3bf43edd8bc22a6dcec8593fd001694e0c35d24d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x116AC 18160 bytes
font_02_sfnt_off000145bd.bin
705e28fc36573d703c39f657587df691b3b595910eb40d64d0dbc99dc220e50b
pdf-font-stream PDF embedded font (sfnt) at offset 0x145BD 10536 bytes