Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd9ec975dd3b67aa…

MALICIOUS

PDF

84.3 KB Created: 2021-09-01 13:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0c779898991285a8af8ce77e245cfb0a SHA-1: f2b5cc09c5c7503a96834d7e7828dbadf53aa857 SHA-256: dd9ec975dd3b67aa09ab4214a36308697c7a092cb9a5e2ddeda29f78188a2c3e
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ClamAV detection and an ML classifier. It contains numerous links to websites that appear to be compromised CMS uploads, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://prtourusa.com/FileData/ckfinder/files/20210813_99FCE4B3976C1B52.pdf In PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/vmabk0776q0vv36frbrg5pop72/82739726837.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/90659895108.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/jexep.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/94292664646.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac10ae4c77e---gisawepafovapido.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/rijabepimig.pdfIn PDF document text
    • http://sy-smile.com/upload/files/95103893383.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/02c55576e53c941652f114b1360a1662/tiwunojufanomunokok.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/zuwokusupibepin.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/fuxati.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/68800456021.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/nozozolosejarutezaxur.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/12566378160.pdfIn PDF document text
    • http://bereanbaptistashton.com/clients/1/1c/1ca8668e480cca1e897b6add33210fc6/File/97416124927.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094af711f2c9---17516726608.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/n8hsggas5vkd1pi2m2ihp99i34/tozinepib.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2f435af5d---bitegujesikafej.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/rafupetijigoxo.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/saxuk.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/79ec5d6506f3a56416d0c6ae437a08e9/pixiwir.pdfIn PDF document text
    • http://ausafe.net/images/art/files/19978057716.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/jopapuvof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=red+selection+photoshopPDF 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_off0000e511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE511 17824 bytes
SHA-256: c32bfb099f8ca96dfb564ad2699e59efb7f2427b7aae4956c4f8aeff35ad0b22
font_01_sfnt_off0001138b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA2 10396 bytes
SHA-256: 3fc0a9cd2e554cfb9654c622a63691eff596a92d9a1dc1d2cacd5ddaaed98ed2

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