Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88a9cace079762b…

MALICIOUS

PDF

90.8 KB Created: 2021-09-03 01:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f291bf7c243c13ccf9e4ef198e702c09 SHA-1: c4f3abd7149b629c1079d658dcd70464fa187d29 SHA-256: e88a9cace079762bb573377b2ddcaf8dfef5946783f4ddb433a53ec670d961ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains numerous links pointing to compromised websites, suggesting an attempt to redirect users to malicious hosts. The presence of PDF link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/ad7t4nbn9o28s0tgcmq4621onh/11957540402.pdf In PDF document text
    • http://speaklifeiamgreatness.com/files/files/38476704493.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083b18d22f02---21787893178.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/46671340391.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/3adaa13976eb615fedb399350f168053/65996596447.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611fa44e8f24b---40197083754.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a873cac3f6262281a3497ba13a30d272/vazikagonifarokaxifas.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/25347571084.pdfIn PDF document text
    • http://ukuleleceilidh.ca/clients/860383/File/tivoti.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/20995890531.pdfIn PDF document text
    • https://zold-kommando.hu/files/48224258147.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/edd250333f7d52b0d998d18e3565098a/6093856669.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160826a69a8163---59686678442.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/2366367692.pdfIn PDF document text
    • http://u15.ch/ckfinder/userfiles/files/jatalavilaboverarepifuke.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/24460677785.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/81990699602.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160eda88bd99c5---bizesubenukinenax.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a444c8008b9---69015964114.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/bugegilo.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/ludatawa.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/a5nj0dpjl7sqfjqi715icci4vl/xijubumekewelesalixugeva.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/wuwutefojed.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/tc8soob0bn51umr5vvrfrs053o/bodedisulorepajezujisazi.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072221b29401---79879657266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=funciones+ejecutivas+superiores+pdfPDF 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_off0000f7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C4 10840 bytes
SHA-256: f228a9454484d7f237ee2fe1ce01e2f2dd690a43cf0ec6ec29b42b5d138af3d0
font_01_sfnt_off000110eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FD 20492 bytes
SHA-256: cb3d1d4aed2792ea3a66774f02de9545e335a98cde63d57786675cf892f2b122