Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ddc64a7e855995…

MALICIOUS

PDF

75.0 KB Created: 2021-09-27 17:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2b490e394bdaa4fc97aa14fe58d2460c SHA-1: a72ff1526243888adb3ffbb1f442186a866a6930 SHA-256: 39ddc64a7e855995ed5a56b3ce7413313d9ccf9d373c372cad9cb18e6c66e2ab
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and multiple external links, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests it may be used to facilitate the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://solarhomepage.ch/fckeditor/editor/images/file/rasuwigibex.pdf In PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/84773755528.pdfIn PDF document text
    • http://datcat.vn/2018/file/logobaxekoru.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/gowigalexatulerideguxuka.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/9642089597.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/roerosmq0h71jrj1nml4nvhvf3/93070107158.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/65046578271.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/93481924840.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/37834695244.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/27891410710.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161510bfe66203---viboxemonumewoxag.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/58225333574.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/wamiwufajukisoxatemavajib.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/zezojokaji.pdfIn PDF document text
    • http://budget-pl.com/ckfinder/userfiles/files/79523787179.pdfIn PDF document text
    • http://blueyee.com/upload/file/191245238348.pdfIn PDF document text
    • http://0048.pl/48files/file/88574445265.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfac499c88---bonanenodi.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/fuwakalos.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c4813fcf792451d8a00dab4d591cd4dc/91882681983.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/20219151933413668.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/basudufexolefusijelo.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/94108637436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=wifi+code+qr+generatorPDF 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_off0000bba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA5 10576 bytes
SHA-256: ed2ac6b47be418c4f4a09dd32512c017776f6cf654a043464002899ce4e3c9d6
font_01_sfnt_off0000d366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD366 19592 bytes
SHA-256: d4079366a17d5948ace5cedc835fa15560321f244b5a803b1631f356c1612084
font_02_sfnt_off000106b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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