Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d515d5dfa41fbf…

MALICIOUS

PDF

81.8 KB Created: 2021-09-11 12:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cbd85ceaa653f3e82c9be5e537ce77e4 SHA-1: 638e397ed415ceda28088b54330f06dcea837cbf SHA-256: f5d515d5dfa41fbf71658e5a88dba1babb6a8eda9c6ef61393aaa6be3d76a2c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://odra.cycling-recycling.eu/imgturysta/files/20398893683.pdf In PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82308764367.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/rilewovefuzakip.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/berajesefusekepobiliga.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/2344ab47e564f0e1c9a7b58b80d541d3/20407103651.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/55310853357.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/11551441636.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/worigerobide.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/jobisewixepefisofixewa.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/97154393292.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109080948041243.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131020d59e8d---34727735064.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/87366260335.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/nuliguretawiliwizexem.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/gibujinesafupologofifavov.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/11263212814.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/nufawamabixerusalizovito.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/tanofemuzozexalipi.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/34316198903.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/27408394257.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/niwuvadazuguwiwus.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///50845842609.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/80921699578.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/77990959105.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613332c9a6b39---31339404185.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613034a40a7b1---gasuriwiwaridibovoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=formula+of+compound+anglesPDF 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_off0000d833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD833 18516 bytes
SHA-256: 2beb645c3e74ae660f42ec7f1c642c4ebfea5084b41b5ddc7e62fe19c43c9a82
font_01_sfnt_off00010894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10894 10848 bytes
SHA-256: 3e99e8dbac3e1ca54420751d1be5b6ac7ead9516d30f8d5844532d132b374927
font_02_sfnt_off00012162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12162 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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