Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea4dcebdc4f538ea…

MALICIOUS

PDF

89.8 KB Created: 2021-08-13 11:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b0878923f340afa9295eebc6bd9771a2 SHA-1: e1bb1cf9e2f58cf044b0a5cda897178639eebaf7 SHA-256: ea4dcebdc4f538eace422180aa7309fbb1c4c96b35e0623acdcdbbd968b1a6b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites, suggesting a phishing or malware distribution scheme. The file's structure indicates it's a link farm designed to redirect users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://queure.ru/uplcv?utm_term=the+stellenbosch+mafia+book+pdf+download PDF link annotation
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/2a79e4b82c303ed619ca18c221f38aa0/96357420046.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16085cb1e1f663---vasugoxu.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/9337e41353493e38afb0cec65edda804/41381807321.pdfIn PDF document text
    • http://funperm.ru/content/file/xedetozimejede.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/48042506558.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/18246270911.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/wapoveruvoxemuvonobizezo.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/3749171808.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/51l6ke5p27hfi454ad1ra7vi63/wemarukivosegerubun.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/9819122000.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/mezebinovawalanuti.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/03s06mf1fvakjips32e4t7rqr0/bujezifanopurufon.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/15234050804.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/munilu.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d25f96fafd639776c1f178aec56dcc92/87313819872.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/43673481377.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b38f4283198---64846477762.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/4529e94b489350b70b663bdcd266d211/20628831569.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/wexixirugevarozelubigo.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/d23b3ae3e861ea2894b9cccc8e50218f/62293963004.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/98260197672.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/kanewesopu.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c56c9aacf4a---jojosipodubev.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_off0000f3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C06 11068 bytes
SHA-256: 163a4a18e7e1200f3b7310471005fc9cd46b9f3b4620e6d2a0f064fe4fe98e57
font_02_sfnt_off0001256d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256D 19704 bytes
SHA-256: dc4bec9cb7492e8352e0bc6ed674d14f63b9ce1326dc4c62740dc1f6e425a8c6

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