Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8aa4bf8ee7eba5…

MALICIOUS

PDF

76.0 KB Created: 2021-10-06 19:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d9b28b543bf99f26beba52609479aae6 SHA-1: 9c7f67b258da47eec72b71a5096bb4e2442affd6 SHA-256: ad8aa4bf8ee7eba5e2838d987451c73d965ab628d0649c2c675cdc0114025272
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure designed to redirect users, likely for phishing or malware delivery. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=trial+close+in+sales+examples PDF link annotation
    • http://kuresi-kaitori.com/upload/content_pic/files/vafodoketoxorubuliwofaxe.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383cf3c325f---28563240484.pdfIn PDF document text
    • http://kgmda.com/upload/files/63443915186.pdfIn PDF document text
    • http://ux-school.ru/files/files/lataxoxefosu.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/27600811207.pdfIn PDF document text
    • https://senegal4d.com/contents/files/lomaso.pdfIn PDF document text
    • https://rm-parketi.si/uploads/gepak.pdfIn PDF document text
    • http://polletnv.be/uploads/files/16563176114.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/nokoxotanasusarejes.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/3e8ef373505be298a8088e0befabf4f9/64431435820.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c10491eaf---nivuxumuxobojazasalawerew.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/15656104360.pdfIn PDF document text
    • https://kaimano.it/file/14621045209.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/12113361082.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614f5319ab07f---musajimirumipareder.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/61820065794.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/fexapagexul.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/zewuropagevapu.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/retepevazuzupenitimiviruz.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/sarexopulinajava.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/xezifibena.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/17721635245.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/tirod.pdfIn PDF document text
    • http://materialskbh.honamlife.com/file_upload/spaw_upload/file/20211006084900.pdfIn PDF document text
    • http://keacg.com/upload/files/bubuvuwiganur.pdfIn 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://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_off0000c153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC153 10500 bytes
SHA-256: ff73cdd21be511aa0efc56ae2658c2aff69a2ca90235db0a5a2cbf3f01519147
font_01_sfnt_off0000d92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92B 18788 bytes
SHA-256: 7bb5b05b7f9568cd3df269d1d2f002f204eb4b30401182b3a21b387b4ae54887
font_02_sfnt_off00010a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1