Malicious PDF — malware analysis report

Static analysis result for SHA-256 7835e8b5a01209ce…

MALICIOUS

PDF

72.3 KB Created: 2021-09-02 23:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3a36a17c34400824f3d894bd6e2199f4 SHA-1: a8a8c6604f2a002f832fc62a1efdf94d1284247f SHA-256: 7835e8b5a01209ce684c3fc11ee4f1e0c03d7ba2f6317cb2be609e6cc03379a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The presence of numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/eb90a1cbc5661fdc7575fb303eed26a8/19773219433.pdf In PDF document text
    • http://rollfactorytogo.com/uploads/files/wipowetidenudu.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160837520616fd---sunibaxonojujugike.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210729_194853.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8906072d1---fagoboxejujebivira.pdfIn PDF document text
    • http://soles2walk.cz/data/file/barazivixoramomo.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16081078a0767b---nabuxef.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d654835ee2---zakimotawaligozakurife.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/75863373719.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021082318360573499.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/27050854336.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa82042d2d---kobekitelutifidexijefodi.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/34886006694.pdfIn PDF document text
    • https://waroproject.com/file/74899173945.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/58778946056.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/vunob.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/gilusijilupo.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735119b5db4---joronobalozusoxa.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/xuromularewilaxigabefoti.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf03b0040eb---burabavegajuxuju.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/64782527638.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702fc09c82f---55693712826.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/witokogoma.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8dd43b8d3---jukoluvekumibugejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=recuperacion+muscular+despues+del+ejercicio+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_off0000b8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FB 10960 bytes
SHA-256: 8c5fca43fa478917cdcd0664fdc009bcc60efc811749ddcc1c0b86682bc89af7
font_01_sfnt_off0000d246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD246 16112 bytes
SHA-256: 36689856cbd5dccc30241e1d30285416430cf138dfb20b17a7c0ed7619480c9d
font_02_sfnt_off0000f9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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