Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ff1dfeec4df1ca…

MALICIOUS

PDF

79.4 KB Created: 2021-07-31 00:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8a8cc02105ee6136752fb36fee1660e5 SHA-1: b352aa8e2930b42d124269db8885629cb366d2d3 SHA-256: a9ff1dfeec4df1ca477dde802d50133a9795fd7ebb003b8f08c1bb7687421d50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection (Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0) and an ML classifier with a high confidence score. The heuristics indicate the PDF acts as a link farm, directing users to compromised WordPress uploads and disposable hosting sites, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external URIs suggests an intent to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://medvor.ru/uplcv?utm_term=8.+s%C4%B1n%C4%B1f+veri+analizi+test+pdf+100+soru PDF link annotation
    • http://makinsushi.com/uploads/files/18956642180.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba64892905e---bokagosam.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/foxeworebozikeloz.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5d4d973b0---mujebunewu.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/zasaxug.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/308e5605f00d68edd647d6fbbf03a784/jikedusujev.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a121aa4f254---96053354441.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/44640996422.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7f5e4d744---nobubovuwixefadotivabew.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/c1bc061f1248d653fbbf94f6c9f0ad10/75093519205.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/maponobemodofazosu.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160fe1124f3dae---pulaboniwuvugevus.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/gekoxuze.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/76854574256.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/50892451222.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/75eb81ed4b04d3de7ee1f0a5fae85d56/3896707717.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/23859625737.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/48a1mvg5ccvot1e1kpha803an6/rewomoja.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b46b0841bb8---funobolo.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/nizimurizumetopigi.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021052702150873499.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/55794549780.pdfIn PDF document text
    • http://teaandtiarasottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/tapaze.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/26353324764.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_off0000cc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B3 11116 bytes
SHA-256: 44d7c4f564495dad18bffd61e993a2122352e74c1417f2f7300f77fddcffdeb8
font_02_sfnt_off0000feba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBA 18812 bytes
SHA-256: 0be957a000fb47e98c8cd3e9b64f3edfeaf9c0d557b0b85ade144959b8c85034

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