Malicious PDF — malware analysis report

Static analysis result for SHA-256 5301805f57f72698…

MALICIOUS

PDF

86.8 KB Created: 2021-08-13 16:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0131798561c4c2c449015bf5d9b9eeb2 SHA-1: 4c0ad3e00b48c2fcb84d246e244523f9bbf2d811 SHA-256: 5301805f57f726982c09ae472d4202ac92bec7bda1fb53c59be603cb65d5a2e8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document may also be designed to trick users into calling a fraudulent support number. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/c1cac816cbaeb6ddbdc5e5321b860164/zamufaluxipego.pdf In PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/77733588222.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/gotunegoxifewuzugugifa.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/zejexuwosijukakarobo.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/wiwabetoxemuko.pdfIn PDF document text
    • https://afayl.com/userfiles/file/16365167867.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/66077979042.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/f452b4918c13805137a2932f3b36bcc7/bagusogimuligir.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc268a502b---29105718827.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/lipuwuriti.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfa4c47e90---xibadutunawukovo.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/cf462bd3780b5170e1d8b372856091bd/depuxoz.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/dilako.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/559c573cdc2b2df8ce397288ee8cc162/goloxo.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/bitefoz.pdfIn PDF document text
    • http://01host.ru/userfiles/files/juwofexixeroxetubemuwa.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610a5b0288806---takofubevinelaga.pdfIn PDF document text
    • http://npas.ru/pic/file/24883188079.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/55645231392.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/4358111407.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/nawerobetudakafagelagu.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/abbd102299e9c5377af136b76ab1ba0b/rubezuzasinoz.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/xajejozizedoniwirofolero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=synchrony+bank+amazon+overnight+addressPDF 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_off0000ed09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 11316 bytes
SHA-256: 5665ec77b2651018e215919d80ecbad8bd356eaf4e0ab25368f1ba9f9b855263
font_01_sfnt_off00010754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10754 16848 bytes
SHA-256: 20692d6d7a858eeb0addb35328d7db50e7ae1777377516eaa588e84c1ac04df7
font_02_sfnt_off0001333a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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