Malicious PDF — malware analysis report

Static analysis result for SHA-256 8854b5281e93701b…

MALICIOUS

PDF

121.8 KB Created: 2021-09-12 14:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 632fdbd79f5d889587b6f32ade8fc0dd SHA-1: 26cfa8aa119dd06b2fe8aa5e67eeea130d86ebd7 SHA-256: 8854b5281e93701b603690fbd442a7f29241bfd5f7b3cf7a0976a890e93bdd08
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is a primary mechanism for executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://inwebjor.ru/uplcv?utm_term=hp+lovecraft+mountains+of+madness+pdf PDF link annotation
    • http://sns-russia.ru/userfiles/file/39338305828.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/jodadiginadi.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/zidemexuviruzolakox.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/18676034641.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/futiwiwenavokusokoniweze.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c9ab53dc6---9702955043.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372dfa29d4c---lexubisojatomipijav.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/lurig.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/50614271492.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/mobipimabusipu.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613256af12509---92152911779.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/56331057535.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/80724965869.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/86893157054.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/dulesu.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/733f6a01ae3cc46a45970d1aa6636c8f/domitorerar.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/vojewuzikusotow.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/jekositu.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/xuzanoxogaposemi.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/mobunuzuduxiz.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/pesok.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021090709182580554.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/lavejirozumitupefiloj.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_off00017a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A03 17648 bytes
SHA-256: 2b969f70693a811328902a6978277e484cd6b3500b833b3d11d2086a5bec1e4a
font_01_sfnt_off0001a763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A763 10936 bytes
SHA-256: 074eaa76be505b558ae9b8703647c722801c4cb11f030dd1f3f236e6db8e8eca
font_02_sfnt_off0001c0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C0B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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