Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc0f2118332fb5a…

MALICIOUS

PDF

83.0 KB Created: 2021-09-03 00:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e07b724e4efe81516ca23bec62ec5aec SHA-1: 513d32e75fa3c32c38809b25e85440d72970bd98 SHA-256: ecc0f2118332fb5a427978f5cd493decb3f09b9b99b139bbbbe587447d70d88f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://bataretak.com/img/files/file/sexozigu.pdf In PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/vqf8j01skdihqohckcfqbl7q67/86478955402.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/vobikuzor.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074d57a8abb6---fejibugutibef.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/20330867594.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db37fa7d5d---98343628305.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b088564665---maxefazegakerawuxer.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/besuravoma.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/60769906953.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/151122412534.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/61475289176.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/23421015344.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/10939862254.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7998151d005df71598f7901035ab9d7/48509472621.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b71940e4e7---pozezixiwi.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/31477685041.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/22059582359.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/bajusokexadamenakanasas.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/57886383280.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/femesobijudonabawuxapu.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/58976026124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=islamismo+alcor%C3%A3o+pdfPDF 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_off0000dd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD09 18696 bytes
SHA-256: 848b3876b75fd1c4ee2bfe8c29f77bf4dde0bebb49ca6416a33e1174f537f8f3
font_01_sfnt_off00010d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7D 10664 bytes
SHA-256: 39b32e09f1c2b62d8c7d5a46b19378aad1d9108dacd3e7c8adfc242f903a47fb
font_02_sfnt_off00012573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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