Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed2a5d43a5d6d84a…

MALICIOUS

PDF

87.9 KB Created: 2021-06-07 07:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 654b068431c3d90dd5592b7394c23cd0 SHA-1: 9389984d3b9e0c3628d520835b5ffadc5338ab69 SHA-256: ed2a5d43a5d6d84ad4434036786bf1de2924520fcb2b8e6016aab02c6faf53a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'Tp-link tl-mr3020 installation guide', likely to trick users into downloading a malicious payload disguised as a legitimate guide.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://allytemp.ru/uplcv?utm_term=tp-link+tl-mr3020+installation+guide
    • http://atomleasing.ru/media/File/nevevaladaboxevulone.pdf
    • https://medtek.vn/storage/file/40399846700.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609345ee30ca8---21762647997.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b428e70a304---80989108274.pdf
    • http://dgjinhak.kr/DATA/upload/files/202106060252397159.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160aeafd35381e---durujulojedeba.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/c814jqh487c1790295n76bjm02/pajil.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/drvam2jl81hvbt8nt3f0kfbo7l/zufinowobopag.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da65d2ce4b---jozonidideru.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4804bcc0e---89857349482.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750b7b556cc---vusomaga.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc0f0e146b---figuwiduvegukemelisavu.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/v3vei20qoka2rckqd7rcq0263n/13318188335.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/otvbh0lvpsu7g5jfveid77cfh7/xovotazomedavam.pdf
    • http://al-bandak.com/userfiles/file/67022675108.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160874eac0b627---xitusogeperufadojozu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115a4.bin
11b14fd902cd6af52410595dde16e2c01e99c1906e188383765dd7edfad0a90c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115A4 5760 bytes
font_01_sfnt_off00012933.bin
2517155c6cf898f6c1548a9fc48f8efbd81cd2f589f7d6f8cfad24faad65b17c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12933 12336 bytes

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