Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9622afb39df247…

MALICIOUS

PDF

71.5 KB Created: 2021-09-08 01:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 915d6212fe532fbe3c11907fe0f01b0d SHA-1: 0d5b8aa8b6cf2735aecb33f4c2e5c5bd7244055e SHA-256: 5a9622afb39df2474a5d7122c739918761a6d45243f727a1f452aecfc288eb3f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are often used to host further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cructi.ru/uplcv?utm_term=imperator+rome+guide+pdf PDF link annotation
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd7950b77c---22026328800.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/14283782732.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23a9d12d77---30796441314.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/60abac441c00c1d9a4b1ddd84aaa68d7/24082136320.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210628144159228.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/29293756817.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905bac77984---neturababu.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/31911445230.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/7211129539.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d1d275b67d421e8e7af22c2a2ffc1f06/64239593696.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/disuminobewixo.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/mesopasavapodupij.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/17107548720.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080de0f4dcca---pinon.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/rv64jkbhs4p47vd8i8uklrsg8o/23769313155.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/sawasusiximitalerozer.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/40021572671.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/bibepobeduzideperusutizu.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/tikava.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/zivegabironawukuvadekiga.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/82813563353.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/xisejapovogekofame.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_off0000b720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB720 16424 bytes
SHA-256: 027b5e64f74a51f708384947c194c799a099d187c1353ccc77a8b8860a606838
font_01_sfnt_off0000e108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE108 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91F 10572 bytes
SHA-256: b2e4c3bb9d8d190025a26cdf14a9dbf750086e28e5998382ba6a0f4e3e1a884d

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