Malicious PDF — malware analysis report

Static analysis result for SHA-256 add21a8f9478cf73…

MALICIOUS

PDF

88.8 KB Created: 2021-06-28 08:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e006359eaaebc75dd8d2dbca4e305b5e SHA-1: 30bf428199c16510fc76c0f050c96fd2470672a3 SHA-256: add21a8f9478cf732c6a34089ce9a4027124bad615e6d38c9e9e1028ee29b106
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of external links and the overall structure point towards a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=bendy+and+the+ink+machine+save+file+location
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/fb9238f68a2f9a633781861a73a35b38/75544811411.pdf
    • http://liccuza.ro/stiri_files/file/72468002188.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/b067f0fdd30cc384d79d702cfd949284/wezonepubotafomef.pdf
    • http://dighakanchaninternational.com/FCKeditor/file/zaguluniwunodosunixiruvo.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16077066f6ba77---43443682051.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/d80c4f3853dd3dffb4480429daa77b3a/kadomo.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0750e0b85---luxisaloborobo.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c74ff97351---mofewir.pdf
    • http://gtlmarinefuel.com/userfiles/file/gobanowin.pdf
    • http://kinel-hunter.ru/upfiles/file/18937821561.pdf
    • https://ahha.az/userfiles/file/80337728485.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f362e3a72e---33477456774.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3f7998904---14595595635.pdf
    • https://blsautomation.com/ckfinder/userfiles/files/30873092686.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609a66b75109e---93576884308.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/b505a8906ca4a0abfe2319f8e2b58e2d/ravujakitabefarumexojaku.pdf
    • http://triatlonbizuterie.cz/sites/default/files/file/24197603057.pdf
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/77893607218.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8834cb671---pimikele.pdf
    • http://paillasse.hu/userfiles/file/getaxatasodo.pdf
    • http://criollo-cocoa.com/userfiles/file/ralogusizubedexakufoge.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/p77g1coskduqbs1qkvqledrspo/nolijalisorinojawe.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/mqlcpv0rpgg8in7ii69rqrmvh8/japuwag.pdf
    • http://msamerica.net/clients/873634/File/kidulidifizuderugasujawas.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_off0000f34c.bin
bc51a000e3468e5115026bbd06ae5119f5f68bbc9626b7cd684076817da3dc54
pdf-font-stream PDF embedded font (sfnt) at offset 0xF34C 10964 bytes
font_01_sfnt_off00010c9d.bin
b9f8a4f8539945fc8b21410500b2292fcac0b6c9858d353f9f952b405222600c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9D 18016 bytes
font_02_sfnt_off00013bcf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCF 16792 bytes