Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f0790d461bcb9e…

MALICIOUS

PDF

73.5 KB Created: 2021-10-04 09:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ea2b0001797d4b29b44e086bd6b3fefb SHA-1: 07263614d9be46820a5fd4856a571a23a94cd64e SHA-256: d4f0790d461bcb9eac1ba0aea5ad3d0d18dd90178e072b18481422d71fa1bf16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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=ghost+of+onyx PDF link annotation
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/92542944205.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/15538259090.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/metizodasijekotimitalud.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/degutamifiva.pdfIn PDF document text
    • http://neteyes.eu/editor_up/tukese.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/beloxane.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/buvakuvolamipiki.pdfIn PDF document text
    • https://tch.lu/files/files/josonakofimunoxanewupefaf.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210914_112841.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/29583946340.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/mefixezisapunenawikijutes.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/60647795464.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/47ad47c3fac5071f427807fa5349b00b/ragezubepida.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161408b9b3116c---lugasexekomag.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16130276fe1a53---60644122161.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/45736654321.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/nevowaresogaxi.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161539cd56e54c---nugofiwivafixidimuruluzob.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/87583726398.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/80506225584.pdfIn PDF document text
    • https://buyafranchise.org/files/files/gizikovogogigudelagobe.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/49346889696.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/lesibuk.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/43945805958.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/napiluwizibiraxutuwisimu.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/damozavexavisedam.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_off0000b9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1ED 18696 bytes
SHA-256: c4cd373fd93da5e7a093a7c4d608768966a36c37aca0482c8d187a2addb78e28
font_02_sfnt_off0001021e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021E 10032 bytes
SHA-256: d43d28aae4cbc87595c44cddc3a3aeac5c46db2e8b12f02eeaf1bf5840f97437

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