Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c60ece23a90b312…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 21:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c4ca0f4f833aa534bd55bd3738b68d60 SHA-1: b0a3dab55f0d9c0b15007a43b8abd489ad835744 SHA-256: 4c60ece23a90b3121fc828dfc050881c6bc02f05e3141ce7b0ce877afc47def5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript and a large number of external links, many hosted on compromised websites. The links appear to be part of a link farm designed to attract traffic, potentially leading to phishing or malware downloads. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ketchas.ru/uplcv?utm_term=equations+algebra+pdf PDF link annotation
    • http://ajisushionline.com/uploads/files/377144520.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f80bcc1454---kopiv.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gokenokewezenavebomowet.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f360cfe7a---52084412509.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/ddc0935b939938431702a7a117f1f1a0/tezalelok.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/73403847252.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/75506435101.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/xivogowixoledes.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/77950228137.pdfIn PDF document text
    • http://vladekoservis.ru/files/46155308661.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/dusilimapodado.pdfIn PDF document text
    • https://nexusmediation.nl/files/66508683175.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/415ddbb190519c92e9698222a046c5f3/74134800387.pdfIn PDF document text
    • http://519pf.com/userfiles/files/17162429308.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/11777844927.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160849c1f0990d---tumerolibufiw.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/60685257914.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/80219631033.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f4df83b9f---kujax.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/99802511320.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/jiluwo.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_off0000d54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54B 18436 bytes
SHA-256: 1edd491f51ef6e06948734373125ccdaf211e05a2580e00af9ac4f8d63f8d3c6
font_01_sfnt_off00010590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10590 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA7 11040 bytes
SHA-256: 99fbf373bcc93c5c445d336c8f59fd1592964da4c1f45a6f3984381012f978b8

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