Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd800dff9f321bd…

MALICIOUS

PDF

70.7 KB Created: 2021-09-24 17:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f3575cd422df1d3371d04f7402cfd129 SHA-1: c7974dfd53cb24d4fe75d40fe9504ea4a349f432 SHA-256: dcd800dff9f321bda1e6fd0baa1358b294efe3a1136d0f7bcf243aff0c30bf56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which are part of a link farm strategy, with some pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://chcial.ru/uplcv?utm_term=best+android+emulator+online PDF link annotation
    • https://dogathermalhotel.com/resimler/files/jabalewetaveb.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/duvonenozurugifulimuwoma.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/65104511473.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/73563820361.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/78199341785.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/sunibususafopufuzitiw.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/wabitewojuvivubonuna.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449f0a4446c---fuzomefe.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/43955453375.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/54246913222.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143c9203b195---pomuzoraforiloda.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/45916548792.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/24533903529.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/579cd8639cb7095139fe4f5a93ba3615/lutege.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109240249285876.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/93009037798.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/36693059391.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/suwuzogawub.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/genumuvujaduzar.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/jategamanivupibopokawari.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/65071430563.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_off0000b0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DB 10560 bytes
SHA-256: aab48f7b46e8a8215e5dbb54ad91cc0bcb5fcbe6f12024ce96d60da539b71b80
font_02_sfnt_off0000e0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0ED 17392 bytes
SHA-256: 1bf065d26725f05fa33869a85620dedf4daffcd7b131b0ec229243869923f8ee