Malicious PDF — malware analysis report

Static analysis result for SHA-256 9309e3204419558f…

MALICIOUS

PDF

94.9 KB Created: 2021-08-10 06:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 823eca076057f87b285a51189bd72181 SHA-1: 864d978848e8420bd70d2a226da82bb5a6057d6a SHA-256: 9309e3204419558fc91b5b051b7e950da8279e6bf2ab8a7ea27833d8a447d310
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves a link farm designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ketchas.ru/uplcv?utm_term=crt+tv+service+manual+pdf+tamil PDF link annotation
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/703beabebae48c1ab70e427ae6f6c6d1/35406316425.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca43029980---totumabux.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/tusekimo.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/3h272ullqtvhm5msqjn9332sn7/fenunetijudesufufekakaw.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084303520219---77654810032.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba3c814d75---jejotozarosakapev.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/c1d8927ca3dd6798645d8ee043049686/jifibinejevomofifogo.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210607_68108823AAE468F0.pdfIn PDF document text
    • http://giaoducvietnamtv.com/images/ckeditor/files/64681886226.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/99009402842.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/58822628944.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096784e35943---fexekutemexapimabuba.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ee17675c316---66856593868.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/36754625943.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/rakenamakovigu.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/negexuvikexidamewabebi.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ada8ecb9770---pefotitozobo.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/tldi5hjcjjmsbrae283961h3sn/jupuvikuvedekupirabelude.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/gimat.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/91471514985.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f69b659df---18749880491.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/8e00c02db6c093062adeac8b26ef2c55/46881482995.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6e6c439d0---luwizarajufazonorodade.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/c2bee5646f55d492a30eab8883f8d0c0/78500187451.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/30432237222.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3c4967bd46---sibavakixitobu.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_off00010b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B39 19024 bytes
SHA-256: 66813cd86bebe5cdf20ef37dafd2fdca491ef9385a814d7b671294661ef5bc39
font_01_sfnt_off00013be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE2 10860 bytes
SHA-256: 02b8644477e7b027cf3903e5f248e75590198f3eebdbcfb64c62d92fc3b7fba9
font_02_sfnt_off00015502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15502 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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