Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a246c45b90d89bb…

MALICIOUS

PDF

77.4 KB Created: 2021-09-02 20:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: eab4663066a598b5fc027009bb3ae749 SHA-1: edf4117b125351c5b6408fae0c4966083c90de74 SHA-256: 5a246c45b90d89bbfc9887b491b3a2c1c0049bf9387598657c194d3efb125d23
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of these links and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702e4dc097b---72116637326.pdf In PDF document text
    • http://aryajob.com/user_upload/file/75743657335.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ceadb4aec92---3710905657.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/33322671586.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/49539313821.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/63682105345.pdfIn PDF document text
    • http://vce34.ru/attachments/file/sanomasadiwitasatemoj.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/78640919561.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/kojubizidapawikavodiki.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/lozuviz.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f43f6a51e---77624424268.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/xesawibenerisulapadofove.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/rixelumafozojisi.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/8i1jof14t6414ef126l61q057k/79249198823.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/29034652780.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/sukozuwuduxonegekoja.pdfIn PDF document text
    • http://familiesforfamilies.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/52883167581.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6321c34bf---94860945223.pdfIn PDF document text
    • http://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/39801009065.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • https://foodvellythailand.com/upload/files/lefanuvadineninurikarif.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/80888425854.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/ropatanewetovumabekene.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=spintronics+report+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_off0000cd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55B 10480 bytes
SHA-256: 0f0766d7a78cc617405c349c3280be06884c6f45c063f5db8ad0a758eba27b9f
font_02_sfnt_off0000fd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3B 16748 bytes
SHA-256: cef890334412a2e251fdad842023a2c72bc4510cffe6109f3d29a50188672e58

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