Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1801668e438ccc…

MALICIOUS

PDF

72.2 KB Created: 2021-06-06 20:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: cf52164af7854593b1fa848b6750e78e SHA-1: 3cda7c98e66fabf3b16d6094fbfb2efbfd24d7f5 SHA-256: cc1801668e438ccc56cdb37170d5b1ad3ec54ae602c3def014404e0f20f199d5
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external links, many hosted on compromised CMS uploads, suggesting an attempt to redirect users to malicious sites. The document body's text, 'Cuanto es 9 8 pies en metros', combined with the link farm heuristic, indicates a lure for users searching for unit conversions, likely leading to phishing or malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=cuanto+es+9+8+pies+en+metros PDF link annotation
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/6dbe3077db338e8ef5ccad3bffca2a58/tevamunudiparuxosukotejez.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa248080b35---rapigajajosasobosu.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/86956417609.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/dejaxufipamo.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf99f54d2b---tubajowuma.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/c9fiig1olbp4rl9afrpjhcmjqs/lejixaxezasalagewixedo.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/34293153005.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb634678332---ledobuneraw.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086b5ed6b9d6---lorulinaro.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24cc60435b---69964609752.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a65e5fe7cdc---82268785324.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/ff77c235c3866fb8cbdde87033f76384/25544751754.pdfIn PDF document text
    • https://davaocarrental.com/images/file/zunelodosarajadu.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ff0bd693a---56635221168.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608feb8b2838e---koxovema.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/2e82ee2757429fd55bb5d62c8afe21d2/mojujosaropimubej.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946c1d004d5---zoxiriramapigorami.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/29812833846.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_off0000d6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AB 5188 bytes
SHA-256: b64fcf92552c58f600cdff17cc41eebfca5107b80a8b4eb31ea2ca349003100f
font_01_sfnt_off0000e833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE833 13456 bytes
SHA-256: 1a0ae12b25c1b4c046afa8165a45930d6e9d86a0f9656afca0e1c310fdb4265f

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