Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce24f78448955169…

MALICIOUS

PDF

89.0 KB Created: 2021-07-21 10:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 481a797288dd4372e7e5d3843affeba3 SHA-1: 790e72364050bbfa798376f52771f47dd8e566f8 SHA-256: ce24f78448955169414f4d148afbe2244d308e85e1f5476d8a8f37ab2fe2bdc4
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://space1500.com/wp-content/plugins/super-forms/uploads/php/files/fd3c412005e847f35e35fa731d7ad42c/39711056093.pdf In PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/6748ba4s4jet0748gvhj0s9v78/zejibuk.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8e7c53afd---mosomitusiradokusumino.pdfIn PDF document text
    • http://smartcevent.com/clients/871459/File/naporobatil.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0603/afcd48eafe2cc32d684d3cffa5372212.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c7aadfa29a45b11ad7e892e8e81fe014/59600958303.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/5f3cdc485a684b2c63a4dd600a18e299/76668745300.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4cd46205b---kevozibuxidigafowev.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/ppmgfc1l2hm65pgjri88ar8uju/pusokokisixubekuzinamukad.pdfIn PDF document text
    • http://xn----dtbfdwc0aaaev8k.xn--p1ai/ckfinder/userfiles/files/tilofomexusobejukita.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9755bc5289---55708275133.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/16557055082.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9d05c97f6---68898411475.pdfIn PDF document text
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/mujosozelabi.pdfIn PDF document text
    • http://mp-journal.com/media/file/13517203760.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160832613a205b---80613984413.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/376ec4c4bfba6f3d8a5b265084411efc/6221023009.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/pujemelatosiretisuxitokon.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/02ec6748ff37cfa6ae7c3aa8c03b9cae/89421731182.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a7dce245b---titodoma.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fb4ecf575---20577645362.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ikjmr5u32e391b8461l52hd2dq/11011734206.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/fc2372d9c84b7342a584aa7e68d7d3ee/wodigafatupabumumexad.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725b20373ba---rodusugejejiginodepofo.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/95709352662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=chemical+formula+of+ammonium+sulphate+by+criss+cross+methodPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF478 17260 bytes
SHA-256: 8ffca8b094732ab2a59e3d813af678118385b9de4db10d2d368431a5879e8777
font_01_sfnt_off00012200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12200 11268 bytes
SHA-256: 138272e122e5ba2f1dd4b29785abec4749ea027f5aaa1b6cf26fe07cf95b4e00
font_02_sfnt_off00013c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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