Malicious PDF — malware analysis report

Static analysis result for SHA-256 125b3b8e8ae74376…

MALICIOUS

PDF

62.7 KB Created: 2021-06-24 08:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 577a586982d6bbffa01434932392fe5d SHA-1: 2203fc9c8cac83100c5f7d9e42f72fae751f12cb SHA-256: 125b3b8e8ae743764129e97e9036587b4598ce099351729242b2f33952bd95d4
194 Risk Score

Malware Insights

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

This PDF file contains numerous links pointing to compromised WordPress sites and potentially malicious domains, suggesting it is part of a phishing campaign. The ClamAV detection and ML classifier indicate malicious intent, likely to trick users into downloading further malicious content. The presence of multiple links to PDF files on compromised CMS uploads reinforces the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8553

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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 http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160847df18c9c5---92567694446.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/sqlcgrahm81ocbtfthvaafuu75/fumezesato.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/so95db1e8f7pltkppjf226td5t/renididuzewewalafefukevil.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8502c11af---nidus.pdf
    • http://nacyc.jp/Upload/file/48570714863.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f61d0c2a4---36788643117.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/fd8e95b35ec03c943a7bffd50621e28c/tagatip.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e257999c75---33960162659.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfd7de2272---79495318305.pdf
    • http://architects-desk.com/uploadsfile/forunapokewivulesi.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/d830adf1b61e45085b52e8135061be82/31447167881.pdf
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/89948139011.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81af7a43cf---temaxalidugejinova.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4b8db05a9---79619453144.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adfda73ba1f---watudokotopuwofedumon.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098388a016df---52747695574.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=manuales+de+coches
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd2b.bin
2406af03de492e27b89a4b4798d95e1e28eeece6671bba32a1693c4b1707fe89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2B 4688 bytes

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