Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19023d02b186818…

MALICIOUS

PDF

80.8 KB Created: 2021-09-06 12:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2a242ecbfc054c937c9a1b74a6242df2 SHA-1: bcb4e38ab96ff8b6532fa67fbf6318635251a866 SHA-256: e19023d02b1868183c769694651ed6b251f66cfe2b18e33209bde72bedf5fff0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to manipulate search engine results or distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution, aligning with the 'Pdf.Phishing.Trojan' signature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.520amis.com/upload/files/54068115733.pdf In PDF document text
    • http://efuturesthai.com/uploads/files/68046695159.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a6d24a3a9---92189093356.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/87524401761.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/90950700892.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cf798aa18---11497712938.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/17746651720.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/demabemisoduzudur.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/luvunekinasexe.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/wuxosuvipapir.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/5dff62dd7949b8ddef0e952423309c3d/ralerefopixixavajuk.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a4de789c4b0---zalafesuri.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aac96b9a4ca---revelonakejakawapil.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/705694548.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/23033151177.pdfIn PDF document text
    • http://4darchitecture.org/img/all/69427699455.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7eae63e05---27711565711.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/69877198159.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161144c4d5ac82---desirodorenoputaj.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bb477af22ba---tiniderid.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ba0ce01b1---kuwigawezomibelod.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fe9b817cc---1471493385.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/52f91968ad1af39953f4e6a86528e043/66167718919.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/a6mc45mt55pnqo9ca0bgbsnn56/36268688885.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/4692858971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=general+electric+cooktop+manualPDF 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_off0000d82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82D 17388 bytes
SHA-256: 8063477b4fa56ddfb27d3a29c661a83f291011a32451e4c1041361b61d9f84f1
font_01_sfnt_off0001058e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058E 10600 bytes
SHA-256: 4dec0a7b3e3821f3cd98dbe0f9ed07e2ba65f40d176eabe41d14f7105acea517
font_02_sfnt_off00011dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1