Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ddcfc3333ab3f7d…

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 02:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d47fa2c9d8d6d483fcaef3e378ca5f7d SHA-1: 687a53b3da257850d53f91bc8b0dcf834b62e059 SHA-256: 6ddcfc3333ab3f7d1ced296fb892380e46172fb20cf530198524c039e3dee299
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://zuestag.ch/userfiles/files/9565383442.pdf In PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a228054d578---53109432131.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e03a6eac765---8072653542.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094b8dbc21dd---popepefalepibexebe.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082770e53467---pubanefiliranidupubalok.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/bfda61fbafc256325f7c014de74d365e/45749165362.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/2efa7acf0dd30bcba491252589384635/vuzakom.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/vkqd84f4nhg9vlt30tbbk2f8mn/20508450324.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/tanezisunow.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f193af1ea---ruramixawobenupi.pdfIn PDF document text
    • https://parkettworld.com/upload/files/sifefugever.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/72700520248.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a633efa75b8---lajoregegoz.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080909043adf---17272342041.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/26926617460.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/digebazisaba.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b65ccf3a2---turorabuxoled.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610477e66675e---taxarisesep.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/30666843491.pdfIn PDF document text
    • https://bojovicsirogojno.com//files/31753015843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=pdf+to+odt+libreofficePDF 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_off0000dce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE7 20524 bytes
SHA-256: 7dd6b8366234b08d6ecde7a6d170a3b1ddd77d73961666362bd16bd365e35fb2
font_01_sfnt_off000112c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADE 10176 bytes
SHA-256: e50a289d3364f1aadac6745fc0558ee59fa1487d7c99c1face5fe31c7978fb0d

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