Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce34be6bd5f3b22…

MALICIOUS

PDF

134.5 KB Created: 2021-07-13 03:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1b5b9053bd3424a21c92efcc1f141284 SHA-1: 45f06021a7b2ba44dd8642c5c33ae037548f7901 SHA-256: dce34be6bd5f3b22bd9e4a23884e52d57e7d1e69657594e63e33dfc188115d2d
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely to host further malicious content or phishing pages. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b9194fa4354---mukizunajedobuferugawa.pdf In PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/11840285196.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b050bf05fb7---72399726230.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/3bs21lpa2gve5sdvg7lunjgs9h/10426905615.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1608f72df65d46---xojodikifuxakedasuwulasaw.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160776dea1c80b---zarepotajutavozuritase.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/wuvudadobazipoxaxewesower.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c09b54a137a---31597069314.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/f8cf5b6296f192298e5d621fd3c51ffc/66921842409.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/zevuguvitezali.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11a98817b2---66862570235.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/s1gl1mbl2h76dbjertcile8u7n/narazewevigevam.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/tuporafadimotixo.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/24573769241.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/278978ae14cc7579c2e9a24a91261070/71693426733.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/12652138360.pdfIn PDF document text
    • http://amdind.com/userfiles/file/xetanunewu.pdfIn PDF document text
    • http://holzbau-napetschnig.at/mudopoxupudevamesakiseva.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/f262bb6f66b64c2571736aed336d4c06/82419209911.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7340b93481---dalotikirasuzekalodinajes.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f0bfa192f---tawolelidirozawunemano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+suite+life+on+deck+season+1+episodesPDF 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_off0001acc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACC3 17984 bytes
SHA-256: 0dc57e16f810e117eab16c89db98a5f124daa1015cb9faa4ebad0c84151018aa
font_01_sfnt_off0001dbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DBCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001f3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F3E5 10824 bytes
SHA-256: 47f67aeb59ef5c7ede7268addaa9cc5dee3e341cecdfcb86b1383e6cb3bb05ba

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