Malicious PDF — malware analysis report

Static analysis result for SHA-256 b658e9f7fb0c9a8c…

MALICIOUS

PDF

70.6 KB Created: 2021-06-10 11:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe72903796c55c1c55c9f920b3837c92 SHA-1: 34ebfdb7858795de7a56a1cb9797903255bc1c6b SHA-256: b658e9f7fb0c9a8c7987fdae1334187bdf905c3863387ccbfe2735ad94f81747
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating it is likely a phishing or malware distribution lure. The document body, though partially corrupted, contains references to 'cryptos' and 'wkhtmltopdf', suggesting a theme related to cryptocurrency mining. The numerous embedded URLs point to compromised CMS uploads and disposable hosting, likely serving as a link farm to redirect users to malicious sites. The presence of PDF-specific heuristics further supports its role as a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7776

Heuristics 5

  • 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
  • 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=how+to+mine+cryptos
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac9f2ef792---3306399353.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6ba7da880---88005372283.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16081e3a67b738---fofezavesazolaxademexapir.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/f2a996c43c95cc7db41bf6d89ce139e0/62975775010.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0a5cd2ff0---9082568987.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607317cbafbde---rokuw.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/as3j5lr61t8l0ujdj11dgvc8k5/22333455915.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/ceb90b107e4e60087ba33d3bfd4ae837/zulibopudaf.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085af2954d2b---vebuxezijuvekotapofowuro.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/f9e97a810037f5fba08132407847507d/tejedavo.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ekodcff5m0vm48mtf41dl1g01s/dalojuxidomijupexasovet.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f25f6e1888---24713103664.pdf
    • https://alutat.com/data/file/vodolasawajer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6a9.bin
1012b988b85f7b885145675f84cefea22a18861b603558943be0318fe35230b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A9 4992 bytes
font_01_sfnt_off0000f7a6.bin
8321990dd93d5f6c1df15dc9a674a516cea56ef2968d711e46c748e2ce9b108d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A6 10844 bytes

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