Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c147e8d0164ddd0…

MALICIOUS

PDF

75.2 KB Created: 2021-09-20 08:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9da25d1aaa2e69e461a6cee143b1b8ab SHA-1: 5e72bbbea63ad3d74636e26173c369051c0cd5fc SHA-256: 3c147e8d0164ddd081e24ee8f1e431140e397833446724e749f56193530dd9f2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to initiate malicious actions. The document body, though heavily obfuscated, contains URLs that are part of a link farm, suggesting a phishing or redirection attempt. The presence of external URIs and compromised CMS upload links further indicates a malicious intent to host or redirect to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=android+app+to+watch+tv+shows
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/85183696155.pdf
    • https://kvzriu.org/images/file/faniv.pdf
    • https://chief-moving.com/editor_upload/file/21936962590.pdf
    • http://hkbroadwin.com/userfiles/vaxobosiwimowulefex.pdf
    • http://orderleesushi.com/uploads/files/xidasaragu.pdf
    • http://tucholainfo.pl/userfiles/file/47151078717.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147af9120487---24078044222.pdf
    • http://aodaiminhhanh.com/app/webroot/uploads/files/zubopifikopajoremigaviro.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161355e086bd29---43602477346.pdf
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/68682446463.pdf
    • http://airmon.hu/images/files/laledodevezop.pdf
    • https://bawaniint.com/ckfinder/userfiles/files/78369809803.pdf
    • http://ciccioinpentola.com/userfiles/files/rodisapovigunej.pdf
    • http://snbedu.com/uploadfile/file///2021090803595552.pdf
    • https://mrdak.cc/uploadfile/files/gadugosilux.pdf
    • http://londonjip.com/userData/board/file/91088103876.pdf
    • https://transturist.ba/ckeditor/ckfinder/files/files/nufovoxenetitipox.pdf
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/lebevurukuros.pdf
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/91046351928.pdf
    • http://evolution-dev.com/file_media/file_image/file/tibepij.pdf
    • https://lomasdelaweb.com/userfiles/2008.09/file/vebisosowuri.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b34649b5e3---sitida.pdf
    • http://congseng.com/uploadfile/files/pedikixenorad.pdf
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mumum
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4ec.bin
687e7e1b448463f60a891d610804e3e063a506db1b135231224b677d1bd1d841
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4EC 16308 bytes
font_01_sfnt_off0000eed3.bin
685a4e00141d5b273f183a133b1a53a818204bf27d50b4628b72f98bae5967a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEED3 10568 bytes
font_02_sfnt_off000106f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106F4 16792 bytes