Malicious PDF — malware analysis report

Static analysis result for SHA-256 1286d96d49a9b066…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 12:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 42ccebe0f27b4e626326bfdf1797e643 SHA-1: 4a9f991ea25ed05f83f783e1c348cbe967fe879d SHA-256: 1286d96d49a9b06600b63c6c7903614ca3940e8327ac1ec67e7fc96b27dd1781
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=88+fortunes+apk PDF link annotation
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/jodisekubirixotejaw.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/wobogufuxemurezol.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/26389910587.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419d2e13d40---gonemuza.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/27974663456.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/fuzadisozufoz.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143f0cf52aec---pukegulubuwo.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/131236258664.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/dagitonawazimumuvoxesot.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/94247997772.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/28200323519.pdfIn PDF document text
    • http://jsdarvin.com/files/11719359467.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///takuw.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/virojevafujakefurizesixa.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/ximogilazuwi.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139aac57a9e5---kuduzejololalejinadex.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/6841271668.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/rugepakepudikejitokoderu.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/rokflhal1m1j1mug26hobk4i9o/72314955814.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/lomazo.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210907205113.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/kujekosezadiris.pdfIn PDF document text
    • https://dafelia.com/files/63509240377.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/37650743015.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e51544d853---xonijizima.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_off0000da66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA66 18260 bytes
SHA-256: bb04deb593cb1407d8113725e38d4943b92e99f290e2ec9339500a116543c134
font_01_sfnt_off00010a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001226d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226D 10516 bytes
SHA-256: d31e60c322c9d887a6614c7a55a66936e2e8fa45a0ed946462172613cfd6929b

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