Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa10aea9b15417be…

MALICIOUS

PDF

68.9 KB Created: 2021-09-06 10:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 28d7b884e12cd58af7847bc32ab090e8 SHA-1: 486609671c70a507e228040b2f74c707235d0d33 SHA-256: aa10aea9b15417bed7af623835deb0dd76a35a2807eb9a4db7dfedad7ea03330
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. This script likely redirects the user to external URLs, as indicated by the numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary goal appearing to be directing users to potentially compromised or malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://alwaysfavorentertainment.com/clients/879371/File/diwezovumereteti.pdf In PDF document text
    • http://guowangcable.com/d/files/kekawakefajopin.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/nujujenasapoperexitixip.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/42417d588032780203a3749de643a210/daxapiwiruzigexudek.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/23866240805.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/57786404637.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/28412231677.pdfIn PDF document text
    • http://rotang.net/userfiles/file/voxagemotejetil.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/3fbb52829931948eb28d7a531e347ae9/dunugonati.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/86884719076.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b68c68eda91---54276077930.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5c375ef0b---rupadowesimikato.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210906_691EB3F4290DC152.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/6160562313.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/relavowabofovez.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/kovarudakes.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b971838831---diwuj.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/25736629657.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/jolokopesarudelekudoreli.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/xibevuvunilen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=schaum+series+linear+algebra+solved+problems+pdfPDF 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_off0000ad57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD57 15740 bytes
SHA-256: 764d19a08c0edb03334a1da9326645989a0017d41498c0b2a2e9a2a285c47e93
font_01_sfnt_off0000d410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD410 11348 bytes
SHA-256: 69f766cf52098688f50e3481fe2db34b209059a0a031251bd06ec0f8b4aab0e6
font_02_sfnt_off0000ee22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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