Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ba899a7d68c42a…

MALICIOUS

PDF

73.6 KB Created: 2021-06-03 16:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00da5915a36357e441d242a0b2f87ae8 SHA-1: d2bf0d74b9a5b8d2d7b17aa388fd1503923f792c SHA-256: 97ba899a7d68c42a725380efc26870e20c07c29a16fa7d2ac8bff2f6e4b7ed20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, some of which are associated with WordPress plugin vulnerabilities. The embedded URLs and the nature of the link farm suggest an attempt to distribute malware or conduct phishing attacks.

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608626d62e128---sopuxo.pdf
    • https://xo-sound.ru/userfiles/file/62318743449.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae318d6b8e0---pekomudafekafaxuzilalanug.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/77bf7dc68997d22eae5b707914e688c3/zibegenozewawumo.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/5af684adeda7f5c0cd3decad1b9938f6/figujefuveboxope.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091d19356ef9---31786755538.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/e41e19594436b74d9075e10e1126bf35/66663351470.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f433613445---fidepo.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b0acc7bbf6b191a3bf073966c03817af/87974192241.pdf
    • http://kibbkw.com/uploads/file/70540176324.pdf
    • https://dolmalatrek.com/userfiles/file/waguzalusazoji.pdf
    • https://noddy.nu/images/file/xozetitikakotemapum.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/961stmu9iabonneoph603cs7ug/lobowesejeg.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-5-15/20210515100046337619.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777552570cf---87092124313.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=zenonia+4+apk+%2528offline+mod+%252B+unlimited+zen+coins%2529
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e104.bin
76096ef44d82b29e68c1272db9397c80900e94400d51c1e9791497c83ad6022c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE104 5516 bytes
font_01_sfnt_off0000f3e4.bin
42a4088bd0629908a7ececa5f91a7902dc135141d2de3b16d054ba576e38e56e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E4 10856 bytes

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