Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eb19317fb886db2…

MALICIOUS

PDF

92.5 KB Created: 2021-08-08 23:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 881918fc3fb2a7c63d150ad1c262d398 SHA-1: 78d0339af39b13e5308419b68f5a8f86586d03f3 SHA-256: 6eb19317fb886db2411b436ff3b98614af6fb163919049f0c417e9a1283822ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many of which point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd4201a4e5---76615952416.pdf In PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/b88b0e423c92b6860abf42519cf80c10/lubovoleseseloxa.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/52156499490.pdfIn PDF document text
    • http://babamoleskine.com/files/file/bamaz.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/toxelumelukexujex.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/palesanabedoxewelag.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/bolarijuxadupivapemu.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/91637922363.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/gorejiletal.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/wibav.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210722_0B8E92516C50AD3D.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/f4baa370b23443a5d222dffa8e67f5c2/37868726009.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/nitodikibuv.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a18ada6b9cf---zabodasufuwenuzuw.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021052517354680.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081d9b90a86f---kojenek.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/33687775170.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/3070154133.pdfIn PDF document text
    • http://berbun.com/user_img/file/tagil.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/o84el05vu2cjut0ga9cd455k6d/20402313616.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/83771886370.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/6d72f8e4070476954994301382ddca1b/23377513369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=manual+del+soldador+cesol+pdf+descargar+gratisPDF link annotation
    • 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_off00010439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4B 18440 bytes
SHA-256: 79b795cf8b7c737a1d77d332decc47286f7aec1e2acbfc9a459889f9881a4ff5
font_02_sfnt_off00014b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B47 10888 bytes
SHA-256: 9358e5834e243b85af1e49d390b2d09e5b0f2ce629cf82840d020dd5e51058fc

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