Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24333f1e5a93aea…

MALICIOUS

PDF

76.4 KB Created: 2021-06-14 23:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ffcb32981eb5cd7d409fc94397f33ce2 SHA-1: 8156535bd3423db82c0faae378530c60b1f2e1cb SHA-256: f24333f1e5a93aea9617c274ab9897e017c193734a595f4b7d30671aa103f638
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan delivery mechanism. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'free bubble shooter games for android phone' and application metadata, likely serving as a lure to encourage interaction with the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nomylo.ru/uplcv?utm_term=free+bubble+shooter+games+for+android+phone PDF link annotation
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/88025323647.pdfIn PDF document text
    • http://lhsclassof1971.com/clients/74120/File/83521337201.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607022dff03f6---28004602992.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608a89300d02f---93321730988.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/91947989009.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file/%5C/2021051606242435.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761a3d1b328---73942117707.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/fukolemogosororixotunuj.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8beabea90---pidola.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/tidafajezimedafugumut.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/10636696115.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/eiovbbjhvr867ch5082ipqboeo/bojizum.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/51524675859.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/jabivorovufegi.pdfIn PDF document text
    • http://yuha.be/_files/file/jarotinafukipaxaneg.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160767de0aa071---75819134286.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/jiwaxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8C 5548 bytes
SHA-256: 394165f7742f49e314a1f3cbe05965812edd478d2c0743160c27ccce3b895256
font_01_sfnt_off0000fe41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE41 10520 bytes
SHA-256: 3b5727b19af82fde8d2fce5dc65b5bbec50420c5cb51f8b0b9ebdeaf5ec9baa6