Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d14b25e98ec018…

MALICIOUS

PDF

93.1 KB Created: 2021-09-08 10:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 79cf0172bbb1f9457641bdad9911b911 SHA-1: cced2d724374e0cd5ac0abb1d219ee8c40dc81c9 SHA-256: a9d14b25e98ec018fd768223975d4659d3c1265ca618ddf7749c23fe8d753bae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://coretry.ru/uplcv?utm_term=tipos+de+personalidad+colerico+flematico+melancolico+sanguineo+pdf PDF link annotation
    • https://soosekszer.hu/upload/files/13730426919.pdfIn PDF document text
    • http://chamdure.com/DATA/files/migajusesola.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d739a2b8a---pigexitefisosasobo.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d38830d068f---tanoxopesenevojamini.pdfIn PDF document text
    • http://henca.com/files/details/file/tigidegibajoxegafa.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/wuzage.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/22565852920.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/54a384aed7b23d78d0ede51bc5b06035/84331675549.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c13e3e40f81---16659324390.pdfIn PDF document text
    • https://activepymes.com/pub/file/55823230870.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/kapelemukipoxomu.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/36c4b4e5ba3dd2ef1279f9b2b050ce2e/rivozimimuwed.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/12alisk36f4i6g95vcfa1e6r74/9685739431.pdfIn PDF document text
    • http://manajrgvaaradhi.com/cms-uploads/files/35380907260.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/sitijifomed.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a9022500e---33093269879.pdfIn PDF document text
    • http://techbis.pl/files/file/13711892262.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/11178580968.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16114d8eb8ba15---jakupiraruxiluro.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/tukelukivovegonaweta.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/a80135438b5c755d142e8743eb099e97/58602724067.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/94351722758.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/74185523726.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/mimakeledetupavurogera.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_off000101e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E7 20104 bytes
SHA-256: ab96e73d933fd3c472024e87a270371ad17ca8fd584576dcfb070729d6dd4341
font_01_sfnt_off00013468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13468 11024 bytes
SHA-256: bc2588f2290f1a750b821e24f09375fe0c034e111a6daf62d1ca549222476fc1
font_02_sfnt_off00014ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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