Malicious PDF — malware analysis report

Static analysis result for SHA-256 554f82632cb492ae…

MALICIOUS

PDF

54.6 KB Created: 2021-09-18 11:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2dcb2a39c2e60f5090a071292f831cae SHA-1: 9f71d08bd0e4907248195336a41e3d99c1860a95 SHA-256: 554f82632cb492aeabc47084246047ea01b887b5e2480250134d00a6880cbeeb
124 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to exploit kits or phishing pages. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the overall structure point towards a malicious PDF designed for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5455

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://inwebjor.ru/uplcv?utm_term=android+mediaplayer+example PDF link annotation
    • https://sporyolu.com/resimler/files/mubofajewim.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/16893548704.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/7069356725.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/7412da8d976fc9d002759136ae2eeb22/gimupivulir.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/naxubesufi.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210904/file/xojebaxatilamibevukemimoz.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/rilokofurum.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/95759947171.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/3609537237.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16136ed8f4ba6b---zadapoleduxunaramuwiz.pdfIn PDF document text
    • http://dd-eng.com/files/files/nuponamilatibedovizaf.pdfIn PDF document text
    • https://ordermorestuff.com/cmsCart/upload/file/94369241822.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/bonigakiboruxa.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/16874681787.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/kesuginutisilelul.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/zitagesijixovamofugof.pdfIn PDF document text
    • https://ghnservizi.com/file/laperuliwupokede.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/11714417291.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/robuliju.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/68575926785.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/68911842058.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/58356478897.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/xuwamupilitogigafi.pdfIn PDF document text