Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca9957c5e0ae51a…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 07:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1dae00ac44a570b73d7f14ae711ce522 SHA-1: f77892458ff3572441831117d1bafee715a871a1 SHA-256: bca9957c5e0ae51ab646bd273bff18e618458633fa5417e84924be432f81ddf7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. An embedded JavaScript stream was also detected, suggesting potential for further malicious actions like downloading additional payloads or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://drafthe.ru/uplcv?utm_term=arabic+android+apps
    • http://spharma.ua/files/file/75975068390.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613219f4e1494---fupuromalarivowebotitaxo.pdf
    • http://heimundsicherheit.de/userfiles/file/89213989051.pdf
    • https://daotaolaixesontay.com/uploads/file/65725515995.pdf
    • http://skinct.com/upload_file/file/Fl202109170203029060.pdf
    • http://p-itos.net/admin/userfile/image/file/vibogotuvotexizup.pdf
    • http://ros-audit.com/i/up/file/pugitojubebefupoza.pdf
    • https://equipelec.fr/ckfinder/userfiles/files/tanisijolejifupekekemepol.pdf
    • http://nacyc.jp/Upload/file/86419803400.pdf
    • http://thangmayedex.com/webroot/img/files/seribogekiwikimogo.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c272d85627---25857990742.pdf
    • http://ambvet-trefontane.eu/userfiles/files/38242701057.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/4c6bca1b07f65698fe0655d35bb89ea6/ronaluregopasiboto.pdf
    • http://simpelms.nl/userfiles/files/vuwirubawibaro.pdf
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/40505477941.pdf
    • https://aedwea.com/upload/foto/gafuratesunekobamepaki.pdf
    • http://di-tech.kr/fckeditor/userfiles/file/91568098467.pdf
    • http://tdjl.com/uploadfile/file///2021090709293632.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/jibume.pdf
    • https://cortopolis.ar/userfiles/file/fopexozewuvoxuv.pdf
    • http://cn-polylysine.com/d/files/81587856822.pdf
    • http://bodegaadrover.com/userfiles/imagenes/27874897226.pdf
    • http://metallpress.ru/files/sozugakipunosuza.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_off0000d8d2.bin
bf31bf75056795aad2ec81412748d180538fb7652c478307339c1a1c2ec51222		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D2 17372 bytes
font_01_sfnt_off000105f2.bin
c5e4297b43efd9ce97ddbd76d233c9e85d17aa4b44a3ec85a9c3a9e8f9f6f0da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105F2 10352 bytes
font_02_sfnt_off00011d31.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D31 16792 bytes

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