Malicious PDF — malware analysis report

Static analysis result for SHA-256 e64dc16fa64cc830…

MALICIOUS

PDF

85.7 KB Created: 2021-09-19 14:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f0987608eb6308a9663ce53b7788e56c SHA-1: a676d5954c39d763ba16cb45dd48535d5556d510 SHA-256: e64dc16fa64cc830c9667a395bf69bd1c177e12dcc75d35536ce827c3085589a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as a link farm on disposable hosting or pointing to compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery through these redirects. The embedded JavaScript may be used to facilitate these redirects or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=android+phones+between+3000+to+4000 PDF link annotation
    • http://utcsp.rustyramone.com/uploads/files/nevokiseguk.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413be384c57---34402550387.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/87847225028.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614309b502995---98272827682.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/63442942807.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/13381817203.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5062c525cbc3680cd228a8c23265746c/vulabenelekugutofizilida.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/loxarebozezojavuko.pdfIn PDF document text
    • http://mlead.net/images/e/file/wupufejezuribawijutabuva.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/nijabaxo.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/t58p63k63qllncovduk6501qhs/98303019976.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/32183382326.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/mijitidijibotenubarumo.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/paratuzutatuzusekiw.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/93875531089.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210908085314.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/30985299661.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/movigepovawokonitogodiwik.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/33168639942.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/56937799786.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/16366841878.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/85043746644.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/tifitobofemusajuvur.pdfIn PDF document text
    • 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_off0000e955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE955 10860 bytes
SHA-256: 957d1e02006d73c50a46a1de319993ed503f0d3191138f560f0d3aff97fa2cec
font_01_sfnt_off0001023f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A51 18148 bytes
SHA-256: a73905e972bb163edff285c79457104df285fd084a93f2091aedbcc84c0ef610

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