Malicious PDF — malware analysis report

Static analysis result for SHA-256 79864b19b2beb522…

MALICIOUS

PDF

84.0 KB Created: 2021-09-05 02:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4abe193dc31f2bfb34633cf01d9b4f87 SHA-1: c8d0819775903478af1436ca8b57d09fc83960cb SHA-256: 79864b19b2beb522c6ee043817983b4548433535e22bbb4028338196c0f298fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised WordPress sites, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs confirm the malicious nature by pointing to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/t7sa7lrmt0e7s56hnm37ss9hcr/11929470827.pdf In PDF document text
    • http://fruitvita.com/files/files/guvagative.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/6040ba5ff1ab70402f1793e860c41352/sujepetekujivapimoj.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702e4240d8e---kipejururiwovewidinokapa.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/30747309307b8ba6dcdae91650792915/33117400952.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/9f05a424bc6809201951e831056cd016/88538642702.pdfIn PDF document text
    • https://motacademy.it/file/belafopebifidixenawenak.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a196807ae47---zivororuvimuref.pdfIn PDF document text
    • http://odumakus.com/uploads/files/63336642379.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/milodositenawe.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/74942387322.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/masipobafowedevijagenufu.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/89282193361.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/46545278413.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/dogarinazobuzu.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/88626281286.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/gedutowunika.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f6a193cefc838ac3571c160b6b446c90/zemojanaresivoxisafo.pdfIn PDF document text
    • https://andhimazhai.com/images/files/juketogeg.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/sepep.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/1c6346c727d069f14ab6eab8c899e84e/93021251649.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609020af67a5f---40304691112.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160753ec9670f6---98012629083.pdfIn PDF document text
    • http://usmleworkout.com/files/file/jakow.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/d1t8a4akottdmd1stvum6nnu1i/romukezezim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=livros+esotericos+em+pdf+gratisPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEB 10836 bytes
SHA-256: f4f10c650f465ce1df3b5cd3c354cb1ba252a9e7ed9e5b1387f4348202635aba
font_01_sfnt_off0000f8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E6 19376 bytes
SHA-256: 958d65f04804cd2df71f5c8b35f24a3640d2a6c27784a20e5c779e534028ce3f