Malicious PDF — malware analysis report

Static analysis result for SHA-256 7770405b119f8e23…

MALICIOUS

PDF

89.7 KB Created: 2021-08-20 16:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f16eb0edec04ffe69d622e35cd1a25d4 SHA-1: d6f4eb1d446a2e8153a691c8d13ff5d1a31e6b9c SHA-256: 7770405b119f8e23ee0914a3c59a63f2353c9e2f946ac5305b06ffbd9e0e1728
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves using these redirects to deliver a payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://medvor.ru/uplcv?utm_term=cuantos+huesos+tiene+el+cuerpo+humano+bebe PDF link annotation
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/6f3ee1975dda7c5f509ae2d4eada33b0/24149514811.pdfIn PDF document text
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/1380667455.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/14850743046.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/ravimuserelitewikosulige.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/lowejefevozumepimu.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/90682978148.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/fegil.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/673103b504ae7f69ae28cc49b79e11c4/19670689833.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/lulut.pdfIn PDF document text
    • http://danielbushreunion.com/clients/41596/File/xusalovofugunexu.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/36917134488.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/48557744104.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/3bd4fe0b61022a89580fe25ac40cdc8d/87840081433.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/d70b752cd8ba5322f3fc09d1d0f31a19/nipedupi.pdfIn PDF document text
    • http://dalaichau.com/files/valej.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/63268857911.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/19012861906.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/60940833506.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/regorazexewubukopowufud.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/9d97ac6d756bc240d1a208a2db71a486/11973795108.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/59783799946.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/96f036a8b9bb88ec28c78248793120fd/nebaxi.pdfIn PDF document text
    • http://wearefamilypalestine.com/clients/3/3b/3bc38fc23f9ffb54b20226cbd6ad6ce3/File/55576280040.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_off0000f934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF934 17492 bytes
SHA-256: 93fe453dbfb5a7303e9a2e25dd083cedfa75b174700429eef48baa7ce5696982
font_01_sfnt_off00012580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12580 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D97 10912 bytes
SHA-256: dbb4c1da90891a2c74d5ed2638bb465c36d214a75877ddc0a47c2656ea005ff9

Open this report in the interactive analyzer, or submit your own file for analysis.