Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb95ad3001a95a23…

MALICIOUS

PDF

71.8 KB Created: 2021-10-03 06:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1e8cc02d483743faf28d37748a13a6fc SHA-1: dc46167366a7101ae5c47b066264b5c5fc143bb0 SHA-256: eb95ad3001a95a2358a58edec424cbcd1316311eadc29d01f4610fe5e93e2d94
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised CMS uploads or disposable hosting. The embedded JavaScript and link farm suggest an attempt to redirect the user to malicious websites, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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=gta+5+mobile+free+download+no+human+verification+ios PDF link annotation
    • http://chinastom.ru/userfiles/file/2477798488.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/1268639c404e4b55106ab6458a87342c/mijesidutak.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/budepelirisizoxujeparoxi.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/59270842354.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/40027212820.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/94863444857.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/6172307481.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/xawetolilejogeledewer.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161558661a3112---tavalenuzezof.pdfIn PDF document text
    • http://bbu.vn/Images_upload/files/fuzedibuzojifibe.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/vazetewevasipim.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210905165715.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/gugatanujopidudelutiturin.pdfIn PDF document text
    • http://hejia-ele.net/upload/35396416022.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/nutojajedokite.pdfIn PDF document text
    • https://ms02bet.net/contents/files/watofeli.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/67796692751.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140842e60c7d---vamuxawesuvipepofaxe.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158e8f982808---36996205913.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/saxoj.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/kigaji.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/64139137353.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/52672949349.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/nkjd8cisd2c2obaq7pvn2352hj/26665523166.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/govofoxom.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/mijazusotuxuxemarene.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210911223636125.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_off0000b78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78C 11308 bytes
SHA-256: cd57aed15fc104dd099525db916bd0851ea06514a910dca0feb44b0f5d7efdd2
font_01_sfnt_off0000d20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20D 14612 bytes
SHA-256: 7afb0e015592d4c66995133594dea582c9256ff980a19a93ba174c9b9afd4c50
font_02_sfnt_off0000f6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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