Malicious PDF — malware analysis report

Static analysis result for SHA-256 49f49d310b415a6c…

MALICIOUS

PDF

72.4 KB Created: 2021-09-03 19:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: de1cc149991f519190639528de7c8a68 SHA-1: d237327d10f7490d882f860cd897833497f2c60f SHA-256: 49f49d310b415a6c1c2f5eabeef858bd5fcaccd4d2c5a7322e8abb308aab8905
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the PDF as a collection of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://coretry.ru/uplcv?utm_term=can+can%27t+exercises+pdf PDF link annotation
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/82a132844a89110e2ca3f059952bac98/44676932616.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/jatazopumunesizuvo.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/vofotapobigenizoj.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/18975661537.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/tejurubelazudozebavasa.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/lunigafot.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/52306238078.pdfIn PDF document text
    • http://valaptop.com/ImagesVA/file/33805693792.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/ririkolil.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/jefusa.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/19446308573.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/oajnq4stmlnf6gtabgonnf54ii/purikexovomugoworurud.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/k6ako7s48fr5956aseti8v52vv/kumubugux.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/1bddfe9f38dcdec8121a5d90a0cd3912/89028787139.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cc2b7a8fa---tosepuke.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/pisbhkgsfgr4sjnpjtrtuldq01/vijuvavoje.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/6026895785.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/kemowevekusuku.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/nevakigesulosowilaz.pdfIn PDF document text
    • https://termofriz.rs/files/86020619990.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/86732048595.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_off0000ba10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA10 10616 bytes
SHA-256: cbf348cf1b5c90406ed22e191d3028179c093b3ea484d0ec57708220a4a19b98
font_01_sfnt_off0000d286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD286 16228 bytes
SHA-256: ae5d14c7a556f0b4d5207f152356a49abfa1ee6c080c95a132532799a77d4157
font_02_sfnt_off0000fc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1