Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee4343ed67afc534…

MALICIOUS

PDF

120.4 KB Created: 2021-07-21 22:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9e9b4d520c443e1b705a933040959b9f SHA-1: 843a9769147ff24e2575a8920c22098b27a4c56b SHA-256: ee4343ed67afc53475df7b9d6a3d6f6a9137bf6d4cfb89cd837045058b3ca69e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to multiple compromised WordPress upload directories and other disposable hosting sites. These links likely serve to redirect users to phishing or malware distribution sites, a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086a4385efdf---57211541498.pdf In PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b5556e6ccb0---25653354209.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/bezudatunukex.pdfIn PDF document text
    • http://tuccifamilyonline.com/clients/b/b5/b5aed9f4ae8fd2b300021b46b426cae6/File/98745930091.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/guwibosatorubekumixiz.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/021c599343a9e33eed6e9ba7e0634369/49176220195.pdfIn PDF document text
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/24253472882.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/jmhe5jnjo2g3fp6mtm26ph7pvg/xuperefebemariwux.pdfIn PDF document text
    • http://klefmarken.se/upload/file/1991717281.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/labazazased.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/menewefitive.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/dee62a2be47d412de4e99ef8575100ac/simoverafufudobedavajop.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe236f163b---15505776903.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/71418669099.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210702_092219.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/mumit.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/8462692833.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/66eb10d1a111a1637e0fdda4e4ecc1a1/tuxotitezodusadavibaf.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/eogqvplrukmnr5qnc6cj5q1867/vijarexawubutufigejigorum.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/jilubofuxegejuvodutu.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/eujp72aknk8ggdb1pidcncq5s5/40916335591.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/81549444727.pdfIn PDF document text
    • https://davaocarrental.com/images/file/37920784303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=line+of+longitude+at+0+degreesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000157af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157AF 17088 bytes
SHA-256: ad061ed00bec0a278b984baee0ba921ecb7722cae4077ef1d40dd9166726d719
font_01_sfnt_off000170ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000188c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188C2 10708 bytes
SHA-256: c1a6a7c8c2e8e93ead60d4dd3236d3fd1aca0e115c33f518b0e6cda4580ddc20
font_03_sfnt_off0001a13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A13E 19668 bytes
SHA-256: 133d9b628d18f93f8d7189a6ecf7cbca8e42a7fc768feb1dc70a3ebb5171ce9b

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