Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a4ee0484a4da02…

MALICIOUS

PDF

81.2 KB Created: 2021-09-14 01:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 332797b2b78b1af0ef540b7d64fb34f1 SHA-1: c5666406f23526e71349e2794d314578f104fb61 SHA-256: b7a4ee0484a4da025717f3d4c37ca6728a7f1e3531a6f6a6eabfd4f21a59d312
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=watch+jingle+all+the+way+online+free+123movies PDF link annotation
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbf1147280---52182355855.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/fijajunuletuzuwasax.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134e3cf7c66f---navoxemurakudex.pdfIn PDF document text
    • http://metabolit.ru/files/file/13710250220.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/34914005314.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/zadofozizirupuxitas.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/pupebusurekexid.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/79669400801.pdfIn PDF document text
    • http://woykoff.hu/upload/file/53640286662.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/jupunuduxeloka.pdfIn PDF document text
    • http://fnathservices.com/upload/file/60160161038.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/27653091286.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/84383427650.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/78463934383.pdfIn PDF document text
    • http://bastola.org/userfiles/file/97794658198.pdfIn PDF document text
    • https://fultoys.com/userfiles/burigixi.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/82095043077.pdfIn PDF document text
    • https://durimawar.com/contents/files/3398937207.pdfIn PDF document text
    • http://pololanna.com/user_img/files/78025671455.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/magovowejotodu.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/wovemifutetaxavabasab.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/55399dec3fba4188876a0a51d89ac695/dulovofawolit.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/42792913571.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_off0000d57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8C 17592 bytes
SHA-256: 4b43b32b716c005fb49c39918978399032e500fb5e593cf8c93eab23a829f0dd
font_02_sfnt_off00011ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE7 11516 bytes
SHA-256: 84e844bcdbed56f6a0858c95a898e2e3bcf2461b2010ba6890b42aed8fb69d17