Malicious PDF — malware analysis report

Static analysis result for SHA-256 54bcc34baee15c97…

MALICIOUS

PDF

78.7 KB Created: 2021-09-13 14:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 36b8b6c96758bcbf5e58908b1c2c29bb SHA-1: ae8d222d3c0e20832e1e54df2766c217899720dd SHA-256: 54bcc34baee15c97262b019f109ae5e5c0a6699b35f83ec0f92d497b03cab3fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the PDF acts as a link farm, pointing to compromised websites and potentially disposable hosting, suggesting an attempt to distribute further malware or phish users. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/8g5ufijip03j0ab5msdkj3dim3/niropobiwepewofiru.pdf In PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22114285726.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/68931682586.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a238fca118---19436036840.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/49981028694.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343fe817538---68467826913.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/bedunomosugip.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db272e181e---40483506362.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/57068617423.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/14986359614.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/jabajonopokivonage.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/nuvusamakijevevafutozime.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/xavudafolavemiwibudabiwu.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/zaboxej.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/bafobodagavavinolujuju.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/tirifuga.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/badagepedevujevewun.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/volikosopafakesadiwupuva.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/mimaridelojotunomokuna.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/72308694499.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/kokalajedi.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/pamisinejitasinuwurila.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/tevosafobekejadumutewe.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d55fe92971---xibaligidujegogixadutiveb.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/vubuwesozawo.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/5945850099.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=hotstar+android+tv+apkPDF 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_off0000c520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC520 10356 bytes
SHA-256: 62840e0595ac5adb49f4e7dffc59b583d3ca734cb3be7d7a0a63b5d4967fa5c7
font_01_sfnt_off0000dc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9D 22100 bytes
SHA-256: 4a82d0c1bdc6a54255e4e0b7cf379d037371a1458d784368dc8de14dac043a8c
font_02_sfnt_off00011557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11557 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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