Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f343b93002ee288…

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 16:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 259d3a38e1351b9c3f86d33c08937dcc SHA-1: b48f4019bca22b0232dd40796f040764142bd066 SHA-256: 3f343b93002ee2886790f76783fb4449cef8c57c78f6fcf00b8304574374b738
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or other potentially malicious hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL findings suggest it's designed to lure users into clicking links that lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://carrasvilla.es/uploads/files/68670402381.pdf In PDF document text
    • http://lindseyderence.com/userfiles/files/31880278043.pdfIn PDF document text
    • https://fuoriscena.eu/file/tepukotadarifo.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c93a66ddb---67327507348.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/hvoqee7quvo82vkc96uicil44f/4760893586.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081b3dfa246a---sulowogadivojoxizexe.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/rapivunovovibifed.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/24536091787.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082555f04991---tawiwotibovupajararuwod.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161286b14b7712---10755934408.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/vubejuw.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/78674162284.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/libatujoxeson.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/0ac99fcdf3e9aa8fc74d5fd1ed4d70fc/4733365484.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/28149296564.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/71660522787.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210528071319.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/81737198975.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/e9e401e2774832212adb95fe259de6d7/tewebabumefivego.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ajp0kbho0a85qdl1709nphbrj4/92286951908.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/40615826136.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/tazipirasevegisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=nibondhon+circular+2019+pdfPDF 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_off0000dbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF414 11000 bytes
SHA-256: ecf10ca6712a76c0d653ca4e79c735c8623c41115b0ec5c7e358861818fd1186
font_02_sfnt_off00010d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D51 18408 bytes
SHA-256: 8c6e51b8d003d80eb7ad820291a8007bbcc91ee092b8ac6950dad5fa36d71c02

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