Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e9a468590fab87…

MALICIOUS

PDF

74.0 KB Created: 2021-09-08 20:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d5e3549c678ff0b386370d5e46c09bcc SHA-1: c4baae8a6fd46efbd3c9f969e0e811843e07421a SHA-256: 39e9a468590fab872d1f039c2ce410a75aa16dedf7192e8923bb2f6485ca5a13
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified embedded JavaScript and a link farm pointing to multiple external PDFs hosted on various domains, some of which are potentially compromised. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/ef0ee4514d14a1bf20b982d81d95575d/ladosonefax.pdf In PDF document text
    • https://fontaine-eva.fr/userfiles/files/mapuxi.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/wuvedafikivurinude.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/18297829514.pdfIn PDF document text
    • http://knipia.com/userfiles/file/segulibegulipagiseso.pdfIn PDF document text
    • https://bor-diing.com/upload/files/divokana.pdfIn PDF document text
    • https://fivetc.net/uploads/files/35627796123.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/89421959885.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/f04a5908225d3a5dbe67941058b4358e/fobebogisedu.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/99273642769.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134da0d681a1---53853485265.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/11679067145.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202196163045349.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161340f5b6f613---ripovudominitepor.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/tutadoni.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/betopogurapikexa.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/66830107216.pdfIn PDF document text
    • http://seto.cz/uploads/154513540.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/95088084621.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/88026226469.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/13de8aa708fe6f37855f43b5753e0d48/21357005535.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/97026140941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=cpt+therapy+worksheets+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_off0000bee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE0 10676 bytes
SHA-256: 42a6128d734d30d9ad87205959292fc6ab98a0248936497b6f6b4f91052451d4
font_01_sfnt_off0000d7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A6 16644 bytes
SHA-256: 0013a73947e4815210f29210f96f89994c7b304da7826850b42892c24e17f459
font_02_sfnt_off00010249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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