Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e06c5df5ee683b…

MALICIOUS

PDF

70.2 KB Created: 2021-09-29 11:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0be8e5f034da2fa0aafa5e357a7b8ca1 SHA-1: 05a817e709bf7a36e380e0f63903a78ba91e4de0 SHA-256: 83e06c5df5ee683b22224b14d97d64cca6d10efe99ce8348c40f875ca5ef30c8
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 pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://huntic.ru/uplcv?utm_term=how+to+turn+on+phone+using+laptop
    • https://finliz.lt/i/File/fibawawotadupolosejoru.pdf
    • https://doublehaircenter.com/upload/ckfinder/files/74311530118.pdf
    • http://productinfo.in/konadnew/userfiles/file/turomixaka.pdf
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/dadaxivavopuk.pdf
    • http://goldenagegroup.vip/userfiles/file/bimafewiwurude.pdf
    • http://kbautotech.com/board/datafiles/imagefile/ketajeraku.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614680019da6e---dufinodikagebojumox.pdf
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sumuxexi.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b441364f7---50168434766.pdf
    • https://hotelcorona.ro/files/93662173443.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406a603f9f1---taromufiviramusazifo.pdf
    • http://nmways.com/uploads/fckupload/file/73466291477.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/4f906694f1ed4f5d0bc177ab3f8e5ce2/36261028386.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/b3254996ffab66dc8249304293ba6a62/turalamumuxa.pdf
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/10867435684.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bd0ca18fa---46476860493.pdf
    • http://rulife.ru/ckfinder/userfiles/files/76008365081.pdf
    • https://franchisefarm.franchiseharbor.com/files/files/50772045696.pdf
    • https://inprovitchile.com/ckfinder/userfiles/files/7014539217.pdf
    • http://conblocmanado.com/pics/file/60551668576.pdf
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/marebafotezadinalosi.pdf
    • http://studiotecnicoprato.eu/userfiles/files/fisujawanipetuzavitazurux.pdf
    • http://old.smartplus.pl/ckfinder/userfiles/files/92395890314.pdf
    • 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_off0000b13b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB13B 16792 bytes
font_01_sfnt_off0000c952.bin
1c3e26ac45b900bf5d3b9600ec8d7f96c6945d2eec253a3074a097d89ab32804
pdf-font-stream PDF embedded font (sfnt) at offset 0xC952 10708 bytes
font_02_sfnt_off0000e1d8.bin
be8bfef33d55fdcded1065f376ca5f407735cab5c0d9d1131476e6ce00d16eec
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D8 15576 bytes