Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed055264a384d21…

MALICIOUS

PDF

86.2 KB Created: 2021-09-05 14:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ffc4f12032f6ab5bf0605ca0b0a72e73 SHA-1: 5e699aeaba1b3194176561162933ac41c4faf0de SHA-256: fed055264a384d212fc526dfe1a98f58265f3e43aa740907cd29edda57da44cf
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crysiq.ru/uplcv?utm_term=libro+de+abecedario+para+ni%C3%B1os+pdf PDF link annotation
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/f833d99d88569789006e2e6508a1e45b/77968484850.pdfIn PDF document text
    • http://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/84157890628.pdfIn PDF document text
    • https://viratrip.com/basefile/travelasreviracom/files/54156800014.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/tanikazigisojowe.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/59915967692.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/64879914677.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/59264766911.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/witapulitowowutodagunobin.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/juvupat.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9be54c8a4e---kiforon.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/73831309850.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611fda130bfe1---53723138548.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7a8c93ae0---tuwewujirekanirud.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/58317693411.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/muminorutesu.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/a845b2647b809e9c9ef846aef8542c8d/sexowaw.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/vugibuluzigodi.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ab55849fd5c---filemazotazu.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801f3eae1e2---bitexekidamedututop.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/sm6eramkeok40r4877v3a5l0d5/lekuwuzabojiz.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/vgoq1ab915npt24qf6a19rb4m2/1281299643.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/60106021089.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_off0000e4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D5 20236 bytes
SHA-256: 2a886ead16161431be69829716be9497d1fbc16875166b8d74c7acf64f357cea
font_01_sfnt_off00011904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11904 10772 bytes
SHA-256: 72bf56d89d7c84f4439523f3fb86fdfe410ac3be8e782ab346682e9df67642ec
font_02_sfnt_off0001316b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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