Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad393de405b0ff9…

MALICIOUS

PDF

85.5 KB Created: 2021-09-06 02:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 37ba4b9b9d6f00c98603eaf7f494aee0 SHA-1: eb2e8fe1aa9e505ca1f3138794635688d7e7a0df SHA-256: 5ad393de405b0ff9710f49c6248a57dc42e70b8b155c40b0e408c9a4c2ef5cbd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gullyracing.it/admin/ckfinder/userfiles/files/23825658968.pdf In PDF document text
    • https://jerseyshorepirates.com/userfiles/files/zowuferikanazakafamijoli.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/7d2d902b5a09596f3aefd1a6eac78771/44187264985.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/tesaxuxasex.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1561111525---65154169769.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/1o4kmr3qp93netg8f03taekr7k/42120672388.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/e372de57b61cf761645b19f40e128091/36232790862.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342fd672878---22619212962.pdfIn PDF document text
    • https://tomas-music.com/contents/files/sagikofaliromevakemajim.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160844cf7d21ad---rezitujaw.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160be96654607f---36284819767.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/firisofokunineg.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897c0bcd45b---16653080344.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/61b49612f5aaf9905fc59ba0dae67d53/doluwegavekulezopawa.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/23609082616.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf03d6616---67078537570.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/99259727898.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084c7ff22905---79498110052.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/xipemapinutole.pdfIn PDF document text
    • http://esangsok.com/upfile/files/18707718338.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/15592461479.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/67775136692.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1625079075.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/56682617126.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=architect+data+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_off0000e93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93D 18268 bytes
SHA-256: 81b643e800eb4162d42bb70dd6ee2408372c0e4908a98728220ee883be47f554
font_01_sfnt_off0001191b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191B 10260 bytes
SHA-256: d0bba3e3e1bda67c0b98604238832253db0613d2b9a84b20cf1515a712f9e095
font_02_sfnt_off0001304e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1