Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3eaba6ca327fa5c…

MALICIOUS

PDF

81.2 KB Created: 2021-08-22 02:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cbe49392d651fdd1714af6aa553055ef SHA-1: ab89652ee01cdd45a6b2b807cacf77341861dbf8 SHA-256: a3eaba6ca327fa5c184eef3a4f4b5da091bb506a15fefef2321b2c815c899279
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination or distribute payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/dd04e6b740e54a8cfed28939ae7bcfe2/kegopotukuvaw.pdf In PDF document text
    • http://degrossier.nl/uploads/file/20970458139.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9f45bde8b---12899574133.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/mefuzigojib.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210708101508.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/kd61jgf04a60f1ebpi1kf9taj3/tonawasin.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/koxuzavo.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/xuwekamesibabegunozuxep.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/41237377401.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/dekozomaza.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c641142f01a---91613359369.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/2f1e28a745ca90a2df20f259755d2b48/suwujosuvigodidisesuza.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1f995dd6f---57856581593.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/suzukagelipidopo.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/retevupudemonirelalo.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/kizijuliwubokokuxiwon.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/namivejopiwepifugurabu.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609547c7a73a4---razaveruwatabuf.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9cad30ec1c15db0b6e3ab25c23493d27/lazojeluripudasogimigite.pdfIn PDF document text
    • https://mollis.rs/files/79348025220.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/j2c8o1n9hcagi78qt0n3kv84b0/16920379499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=pe+civil+reference+manual+16th+editionPDF 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_off0000da1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1C 16848 bytes
SHA-256: a4173130aed6a6632e2a9432f996dee13a03fcf80b258b61f1c02bca2c087c5a
font_01_sfnt_off000105e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E6 10960 bytes
SHA-256: 64f0a3f9e88ae6212ea66fa6f56b5455da04d47e2da268bb4222cd9fb3c2323a
font_02_sfnt_off00011f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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