Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b296cde5a8cd0dc…

MALICIOUS

PDF

85.9 KB Created: 2021-07-03 18:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64bd3d7ba814385148779552d30760dc SHA-1: bc6aa1c4aff955fe961dd64d2cecc04bee99317a SHA-256: 9b296cde5a8cd0dc89c8ffb8eca9c98dd3b4da14f95af1d3f1e7e314a2bc0002
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users. The ML_NYX_PDF_MALICIOUS heuristic and ClamAV detection strongly indicate malicious intent, likely involving redirection to phishing sites or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/fk2ku4di4o8prvembk3dnebar4/39803418189.pdf
    • https://balaji-technology.com/userfiles/file/55797310135.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/67479cf10c7f279753a66de2a7e9f1e9/refixikojabuviso.pdf
    • http://bagumul.com/file_upload/spaw_upload/file/20210610023616.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c13c8ceac9e---97963301264.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/158ddd6e32a82aa31860333a4074d09f/99094943933.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/2c0aa1abe8055e26f686f83672ba524d/8753908103.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/b41e5052b5c6402d048b626a0555f72d/88645960223.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16090c4f09054d---jumilituboxixagukajemas.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/5tvr0cepksj1f2o7k951g9qna7/fopotomegewabozefa.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd42f7909f---zemeluba.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/564f33085816995e5da06aa956d66862/namigoriroj.pdf
    • http://0vote.com/ckfinder/files/24039354805.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/799c90b412a4d8d50c838e66e50e8744/vedidokebediwebup.pdf
    • http://lucchetta.net/userfiles/files/xajeziwofetobaxa.pdf
    • https://francois-daulte.com/ckfinder/userfiles/files/bodovuviwafanujelinifam.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081499f9d620---81367956672.pdf
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jufupesarokopawafumoboxe.pdf
    • http://mariamozharova.ru/uploads/files/12217848026.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/037fb3db930f9402ad49b291e220cfb3/89430512955.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4492a13c69---53816984003.pdf
    • http://ergo-logo-bamberg.de/userfiles/file/66826435891.pdf
    • http://stellarp.com/userfiles/files/79065521924.pdf
    • http://altiro.nl/home/tjerk/file/marad.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=kanmani+anbodu+mp3+song+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb4f.bin
c99ac9525517ff1aa3f1de25254134b8bca45139d1f718788ab0673e89630a4c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4F 17140 bytes
font_01_sfnt_off00011844.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11844 16792 bytes
font_02_sfnt_off0001305b.bin
1a53c1528febc56d8e77f3967c433fd7baeba852fcf235424c0f2dcd4be587cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1305B 11232 bytes