Malicious PDF — malware analysis report

Static analysis result for SHA-256 0394240de550bfb5…

MALICIOUS

PDF

87.9 KB Created: 2021-09-06 03:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 549f889b39fe57638b68306f552fb490 SHA-1: a77995be9af91a783538484bb5f828e725faff5c SHA-256: 0394240de550bfb53cbc3a89f8f3bb19e51bc0a95e0a5d5f265f83ce1412b9eb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of multiple PDF link farm heuristics supports this assessment. The primary function appears to be redirecting users through a network of links, potentially for SEO manipulation or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://www.cottagegrad.ru/files/file/9619848787.pdf In PDF document text
    • http://dmkaudit.sk/101/upload/file/zadoz.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/dglmjvjke35pc1uk5ttvb8sju1/xuwejozuruzobizekawavopi.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/d0d20ae194f614542ca04a81222c441f/xolunawobenuvado.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/fidafigagefogijodipo.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202108262313271337.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/nufikakopefivawakon.pdfIn PDF document text
    • https://arerp.kr/data/file///79610193822.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160780da33a1da---83252146008.pdfIn PDF document text
    • https://curvy.tw/upload/files/84139400705.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa250d1b84---26535455570.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/54893834492.pdfIn PDF document text
    • http://jawarakreasi.com/file/61817884669.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/palizidakeluxut.pdfIn PDF document text
    • http://shahgrp.com/uploads/mebekej.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607747547a9d4---bivigux.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/xoroxovasa.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/4q2c74726sgq7o2mnsjjtbecg4/nevume.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/18191071507.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3425c66cdf---rotofejiruwefofo.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160762057b248e---zaridesotab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=fisher+price+mobile+projector+manualPDF 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_off0000ef28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001073a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073A 19048 bytes
SHA-256: f0507c6005a2f59526221fdddba3c8fd572a3e6aef7a1d7f4a3b349b51c8e13f
font_02_sfnt_off000138f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F3 10984 bytes
SHA-256: 45455a108f62795147df18d82ef00ab33662a89890528a43b9a0ba8552f53381