Malicious PDF — malware analysis report

Static analysis result for SHA-256 227341771386552a…

MALICIOUS

PDF

81.9 KB Created: 2021-10-07 22:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 000e575f2e0441014ce6b3beb3053631 SHA-1: c95db0b2720d0f25e8e0b2a4f0d3d59b3097a2d9 SHA-256: 227341771386552a0ec60b5285787ccc3fe590546b4d5ace51a51a8913b84db5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and flagged by an ML classifier. It contains embedded JavaScript and a link farm pointing to external websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely for downloading further payloads or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://emailing-online.fr/uploads/userfiles/file/23046200770.pdf In PDF document text
    • https://elemental-ia.com/userfiles/file/pakojurex.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/zudulumujuko.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/71581023396.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/1b08ccdf1221f05dbe0daa022a18d568/juzaki.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/66904911087.pdfIn PDF document text
    • http://orenprom.com/img/account/file/norogotoruvugubejulepafe.pdfIn PDF document text
    • https://rrhh.fronteraliving.com/imagenes/contenidos/files/nufonitovutujisuboxi.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/rasejuvan.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/62495568939.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/19941750023.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/a2g00g3c7esa6h5l1aseevcgl1/55643188005.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/89607597796.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/8621478728.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/liketasefikinijozo.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/afd247b6ac5d0e5919782981e40023de/tagudomenajanex.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161441736f2c3b---25178810487.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/74469589659.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0590e0f01f6b3e7eb254431a71430f25/sowifobitopebanoregagozo.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/95917642112.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210903_FF131C6AAF84172C.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/xirotarupilusizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=machine+learning+a+probabilistic+perspective+murphy+pdf+downloadPDF 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_off0000d66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE81 18820 bytes
SHA-256: 79446cda674cb2f3a7805ce508bb7c30720c7ba359f7b05d3722fde702326dc0
font_02_sfnt_off00011f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F04 11568 bytes
SHA-256: 7caa6f0e432929df22648242c0ee8362141e59546961762d24ce351d7bc71d2e

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