Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccd716d3ddef527c…

MALICIOUS

PDF

78.4 KB Created: 2021-09-01 06:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 25e5348a5dcd8c2741315c93774911e6 SHA-1: cd2eda23d49c6c622da89aa0b6543b51297b11fb SHA-256: ccd716d3ddef527c83309e63d84d4777be22d3df14b40a52339590ac70b9a4f1
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to external resources, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm used for distributing malware or phishing content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=goodnotes+cover+templates PDF link annotation
    • http://alexanderkanevskyartgallery.com/clientMedia/file/83636410513.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/lekataz.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a430b338f51---79786724814.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/pilaxutimowojiwenegepepu.pdfIn PDF document text
    • https://kultmotor.hu/images/files/28533066922.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a431d056c7e---35121213980.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ba10d351a---87896419204.pdfIn PDF document text
    • https://longhoang.vn/upload/files/bimej.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fedf569f9---kowotoninijovi.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/xusinizebapipima.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160766eff6d2f3---70451664379.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/genijapibefofowaw.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/fc250f204bfe96a5f8e96f254c76670f/45521795874.pdfIn PDF document text
    • https://andhimazhai.com/images/files/vebipoxusibe.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/5f1b26a378aba231392bae1773678346/58666024749.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/zilove.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a348d6a9a58---vamavojigatifizedamapidu.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/gefb2h7ftpkk8gojblu7l0g7lj/35088047385.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/faxobibatu.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/nexulopuvaga.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202108150438321071.pdfIn PDF document text
    • 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_off0000ccdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDC 17936 bytes
SHA-256: 73cf4ae0efb0f713de1c286308d438ffbab9a5bc6b11ed4a66f0f357f197e381
font_01_sfnt_off0000fb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB85 10688 bytes
SHA-256: 25d9eed96313f5ffd9cc7c5651a1ad25da16f3ae8bf447beaab837414cab79ff
font_02_sfnt_off00011419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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