Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7bcf8ecdfe9224…

MALICIOUS

PDF

150.9 KB Created: 2021-08-25 06:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2eea887c6497ea3b1eabc9e7262ac84e SHA-1: 4c1b084980b2ad2446a9b41401b5a4a724acbc15 SHA-256: db7bcf8ecdfe9224b337dbaa748c7cd1e3d44220cc7bd468225451e9b42da8f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host or redirect to malicious payloads. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or downloader document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

Heuristics 7

  • 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.
  • 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://z-i-f.ru/userfiles/file/85712022482.pdf In PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/gewonojepuwibeninurumet.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/guvizenuwovenoworudo.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/qkrarvtd57mtba407bj2lgoa0f/5494993844.pdfIn PDF document text
    • http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/45157604317.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/rukifopexonidu.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/bc28ec4ead1b93f11bf6e3b51081ed63/41188972391.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/namamatasezesomusunuxujix.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/39830435552.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc117b8d75---tewosajufe.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f10c0b95315---petibepuladekokovajogeda.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f457e906fa---15856772663.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/96340358297.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d899eb11ea7---mevuwibesogeg.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779dad87d96---moditutenalositu.pdfIn PDF document text
    • http://df-2.de/images/daten/file/gejidakerijawaxiperoniw.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/38056689536.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/laxipiluv.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fc10a47ea---wukuvulunebopedudum.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/a0ac40be3f17ec9cd3488258507915cc/87251823409.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/poxirizisogosawova.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=hecate+goddess+of+magicPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ca2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA2F 16104 bytes
SHA-256: 741d75bdb569c88f252336e4397a3e82a4050fabe9e1ff09c52484b1002b1a60
font_01_sfnt_off0001df80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF80 10560 bytes
SHA-256: f4724ebb706f775e682989b36448a5c85b1b9c0d2766adfece437e1a11749940
font_02_sfnt_off0001f768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F768 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00020f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20F7A 25344 bytes
SHA-256: f0c2dc61fc7a17cc02536297ce814c16631de8b4ef90034d80ad56b2a5f06b52

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