Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9eeb52e93c199dc…

MALICIOUS

PDF

86.2 KB Created: 2021-06-27 21:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6f4efedafe8becbd7cca061d340da4c9 SHA-1: 0a0a808c5eaf8c450c962f8f5e01bc9d022957d7 SHA-256: d9eeb52e93c199dcfa4dddbe66e5134e079c57126f4e7a195084798dd622b682
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and links to compromised WordPress sites, suggesting it functions as a link farm. The ML classifier strongly indicates maliciousness, and the structure points towards an attempt to manipulate search engine results or redirect users to potentially harmful content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 5

  • 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.
  • 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://huntic.ru/uplcv?utm_term=equivalent+fractions+solve+for+x PDF link annotation
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/s4br29e1f4eulv34chos37mfik/kuwixit.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086249e40888---41139332746.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/e0e80f2cd502ea693c139ec02fba3303/juzodedajeginafexejurile.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/en8q3j4117mfestmepcojea9r2/kujemeluxenetirim.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/f523f2830058c6eb736afed85d1dd2bd/19600567180.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/mezefudisevovumipumufu.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/xeguxinejemimew.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12f2e1f3c5---86580393619.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/49111733957.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/73852620069.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/3c168680e6ca81be3bb07df57552a174/6008980293.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/94b59bd7ea44e2d1ddfb8cf53ced6279/kepakigolufip.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/7dcabf0be84e673f7bbb8269647c25f7/zegan.pdfIn PDF document text
    • https://datajournonepal.org/files/59095621239.pdfIn PDF document text
    • http://wohingltd.com/userfiles/44566011431.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/latusegugenuturoz.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/804a9c4fe12a71bf26dfd4c1e7d9de3f/64248716925.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/49daee701f301877a878ac1e53b5acf9/bewubusunotexezagu.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/sapudadoditufeposabu.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/fb71c21fc4fe4ffc4bc4939a551f589e/tizopejazup.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/jumnmc3a9hp94ogif0csp2jeg7/nexovuvavenawoturifir.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_off0000ec0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0C 10728 bytes
SHA-256: 111fade47f1a63308966e8de3e8177b2c0c37892b0ad5559603ce542810d4937
font_01_sfnt_off000104d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D8 17728 bytes
SHA-256: 4138b611cd59ad035ce110076151379b09efe2f407249465a605fa7347adfbaf
font_02_sfnt_off000133a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1