Malicious PDF — malware analysis report

Static analysis result for SHA-256 429bc09b44ab2c57…

MALICIOUS

PDF

69.0 KB Created: 2021-10-01 06:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 648c69f608cc4a9a553848764c1e702a SHA-1: 072783443ba29a1e7a9e6d387d92ff2e72052f16 SHA-256: 429bc09b44ab2c573f55ba50b60330ae2c3802e52a138f8a4f38d90e29273b3e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://balmybnb.com/t/tutorfirm/uploads/ck/files/tifazafifopepevuzekek.pdf In PDF document text
    • http://3sdent.com/upload/files/72806280186.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/84698773844.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/7014e1428e25aab7da32ad553bc6b0bd/87747994426.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/90385466560.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/78498841992.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613acd29cfffc---27595964073.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/85903318106.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/54261306568.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/wiwixejoj.pdfIn PDF document text
    • http://runhouchem.com/upload/files/93488177328.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/pajotejavoz.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/161511ca885c9b---gizejol.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/77238185571.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/1255ace0d423da5bfbd99d4fe330975b/gisenolabamuxokaxe.pdfIn PDF document text
    • http://chinalabware.net/d/files/ruwivojuzaxalidu.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/labegutu.pdfIn PDF document text
    • http://stroi-sistema.ru/img/gutupawidajefetonedun.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/wofixusefinanusak.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/54149367713.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/18582429017.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/mebarira.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/lilazidivadomageben.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+best+item+shop+in+fortnitePDF 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_off0000b1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B8 10516 bytes
SHA-256: 390211340cef4eff10b2cafdf6c56a5673411f32c9d3eda784697e0b9eec2850
font_01_sfnt_off0000c93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE151 14608 bytes
SHA-256: f77449393f4b6101c7fb44cd9d3720317b915e0d3099f94dc0003b0f1f2c2a17