Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfff7a6614a059f4…

MALICIOUS

PDF

80.4 KB Created: 2021-09-12 12:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 011a646b4d0d92e66af56cc5f02115e2 SHA-1: 7c7832e3fee9aee39aaec7d32af0aae971a1610c SHA-256: cfff7a6614a059f49815fce7c71a6ab745dac30adf8de0e08afd7dc231e48988
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream, which is a common technique for executing malicious code. This script likely redirects the user to external URLs, as indicated by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ClamAV detection and ML classifier further confirm its malicious nature, suggesting it's a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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://kristinanamaste.eu/files/46078298664.pdf In PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/18035308434.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/ganitadubo.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d61167bb80---gikukapeduxapebuvinaposu.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/50226654155.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/444302a83f742cbd8e7bf4158c7a4dec/lenogajeripanuwof.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/vasagotipeluwugoxixeg.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210904015115_2127876623.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/28139940672.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/84903149959.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/13051992712.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/25355560795.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/85029480106.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/sixogi.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/53800891467.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/71578478129.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea55ddf76a---kodojewod.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/jutonisosin.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/52016228503.pdfIn PDF document text
    • https://bor-diing.com/upload/files/kunujol.pdfIn PDF document text
    • https://clinicaalcantara.es/sites/default/files/userfiles/file/28695298835.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/47176351610.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/91262158242.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16131c7debe844---40023049970.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=asiaflix+download+pcPDF 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_off0000d792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD792 10452 bytes
SHA-256: e793512818c21307efd19fa40930bcaeb722a5a548540a077c04a4edbf4ee907
font_01_sfnt_off0000ef72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10784 17628 bytes
SHA-256: c3ed656f1c05bcc8e4259e2a22f068dfae025e7ae5de82a5293071c0e8aaf4f6

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