Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab33f06b8ffc6721…

MALICIOUS

PDF

80.6 KB Created: 2021-09-13 20:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 158bb485600e8002bd39630f40406d3b SHA-1: acb0df1b9b3a66a9583d0302f1e88e9dbb672b60 SHA-256: ab33f06b8ffc672131fcca9969140ea1a2a45f4b8b339a90f91a5bbf7e6d6da9
164 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 embedded JavaScript and a link farm pointing to compromised and disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely for downloading further payloads or redirecting users to phishing sites. The link farm structure, including URLs hosted on compromised WordPress sites, reinforces the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://highlander-inn.com/assets/userfiles/files/19146998770.pdf In PDF document text
    • http://rentaruedas.com/files/others/52239069831.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/depojimodotot.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/zipiradufazavibi.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/teguxadenomaxulodevep.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6bda5f6da---40110841462.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109062325522456.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131a8c8bb865---gigife.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/rafukiwemavixorumoviwo.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/sumupa.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/38560427886.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-2/20210902065122544641.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/ef86a065fc7da1bd21a090eb298c674c/75331770189.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210910_761FC8A3BB828AF8.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/8723895530.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/8084946837.pdfIn PDF document text
    • https://rais.bg/uploads/file/sogenojotunegizivixotil.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/dewiwujili.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/89085416172.pdfIn PDF document text
    • http://airzo.net/userData/board/file/pelufibivorave.pdfIn PDF document text
    • http://modern-pro.ru/files/file/zijarokodawonomi.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/64784382663.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/83746755614.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/ranazimijezolopi.pdfIn PDF document text
    • http://k1a.ru/images/files/file/73062104238.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/kimubetutodisefanova.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what%27s+a+pdf+formatPDF 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_off0000d7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E8 17280 bytes
SHA-256: f31480f5546ae819b4555f8251a27b4ea4e47029dd44d779ad89aae4edcd3e29
font_01_sfnt_off000104fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FD 10416 bytes
SHA-256: 05af0e3663eae0f1d28d85cfafdefec3d6da40393009fc4d02a12f7343abd05b
font_02_sfnt_off00011caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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