Malicious PDF — malware analysis report

Static analysis result for SHA-256 826a6efb4be6e75b…

MALICIOUS

PDF

90.5 KB Created: 2021-08-20 21:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 117b90905f9f82324276cd3fd489847b SHA-1: 938ebafea0751904c55bdbc62f75e71c4344dd93 SHA-256: 826a6efb4be6e75beb805da5a59d6ea69df5e49b8353812f721417111dc9dafa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://momsgardenfoods.com/ckfinder/userfiles/files/22710748893.pdf In PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098361f638a2---99264427660.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/sibodezabufokemojag.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/58901725981.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/2f09f3d75da1c74818b83d78ac27ff99/41136456668.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd7e838c6b---50837860902.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/3991613864.pdfIn PDF document text
    • https://sce.tw/uploads/files/60cf4efdd9697.pdfIn PDF document text
    • http://glttek.com/userfiles/file/61707068760.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/3222541613.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad67e470f39---dalibifatosuxaz.pdfIn PDF document text
    • http://favorit.pl/userfiles/file/xofivu.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cb73ecdc481---pifipimesirilamogonemora.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/fajtrr018hmguqcqnjoabupov1/10779427117.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/mujunififogadiwita.pdfIn PDF document text
    • http://shophouse.info/images/files/mokemoxaxarimigawejek.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/9m26jpplv501a7iep3rdrgu4h0/32966575594.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/mu0bpibu9s3tggnignit836oku/74611203538.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/kezufapefimosesadexinuga.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/tawixefefabagaroxo.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/diduwumidivuza.pdfIn PDF document text
    • https://schmitz.cz/res/file/97384142479.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/barizopikisop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=modelo+de+demanda+de+prescripci%C3%B3n+adquisitiva+de+dominio+en+colombiaPDF 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_off0000f84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84E 11256 bytes
SHA-256: 5562d6c4677290d83494296d953ea4a0fc52d64881092fdd96de7aafdcf9bf2f
font_01_sfnt_off00011208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11208 18056 bytes
SHA-256: d03851e53b5d0caedf06361d3d74ff01864760e25bac1b29c1365bf217e85361
font_02_sfnt_off00013f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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