Malicious PDF — malware analysis report

Static analysis result for SHA-256 be91578224db01fb…

MALICIOUS

PDF

83.0 KB Created: 2021-09-17 00:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d2780866c41e0a1c9d54c010e5e8266 SHA-1: 7a792774dde6e68d300d2f6d04ff691edef67be3 SHA-256: be91578224db01fb8ebfb7b2c7a03daf0386ca4b22174fc49667360623e1d07c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16139d1dfda076---kojosajudivenagav.pdf
    • http://arredamentoambienti.it/img/file/14922357167.pdf
    • http://goldway.jp/upload/board/file/47516868270.pdf
    • https://karlholmbygg.se/UserFiles/files/27964751373.pdf
    • http://espressobuilders.com/app/webroot/files/userfiles/files/78509090008.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/amnre54ltrj41bnnnrc7pkvic4/59358599374.pdf
    • http://gongotour.com/FileData/ckfinder/files/20210913_3C9F651C16D4BEB2.pdf
    • http://clinicaveterinariailmarzocco.it/userfiles/files/621194894.pdf
    • https://lapalettedesarts.fr/gestion/file/jipazojuvarabevam.pdf
    • https://tidaksusah.com/contents/files/xuvuvosonofigatomolifipov.pdf
    • https://mots.alaxarxa.cat/cmsimple/images/file/9107254496.pdf
    • http://tongchangkj.com/uploadfile/file///2021091008123910.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bda00be7d---86250305819.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613073534f9d0---zikizonuxomikagup.pdf
    • http://teplospectr.ru/images/files/40419450917.pdf
    • https://www.assofmt.org/ckfinder/userfiles/files/zimup.pdf
    • http://motoren-adachi.com/js/upload/files/68760989691.pdf
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/zijur.pdf
    • https://brianspradlin.com/userfiles/file/814413765.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613446265f06e---61773185355.pdf
    • https://aiaciran.org/cache/fck_files/file/lubijibekobemuli.pdf
    • https://jdrum-music.com/uploads/ckfiles/files/webobugijadudosidopofo.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613407b9d724e---27277566977.pdf
    • http://samuiluxurytravel.com/Uploads/file/lofosutati.pdf
    • https://interstudy.net/userfiles/file/27010391402.pdf
    • http://www.rannatennis.ee/data/upfiles/files/xuvukodanojidudo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+play+gba+games+on+android
    • 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_off0000e0ba.bin
1f2d8c910ee361a3c1a6ee82b485c0c468698a02727d4bb673208f8ae38494de
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BA 11064 bytes
font_01_sfnt_off0000fa16.bin
5c6fec94d3fd8e0b703f8980fbda726ee62411dd0c28bf0daaf39ffa855da12b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA16 17232 bytes
font_02_sfnt_off00012659.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12659 16792 bytes