Malicious PDF — malware analysis report

Static analysis result for SHA-256 7264441a4085ba95…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 01:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1cc073b8b2f6817472f3fed7aaacad37 SHA-1: 1b3cf658e3fdb10f96cfa273539702ad20900724 SHA-256: 7264441a4085ba95a6287e785a0b8ac6355808bbaf7fbab26ed6e109c188874d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript stream and numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggest the document is designed to redirect users to malicious sites. The primary attack pattern appears to be a lure, disguised as a search result, to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=electrolytic+refining+of+metals+pdf PDF link annotation
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/39790673294.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/j19ndbko0kf047g2al1m2fnhk0/74221977853.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/5f384dc30234d58210becc40ba07a4cc/gamokozepajew.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4345137d3---zilav.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/0799f8ce1fa33be53b4cd7d7d6125a8e/4374599360.pdfIn PDF document text
    • http://iknow.pl/files/file/putogamobewosofafa.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/gevegomif.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/2fee41c6c5db6f7754264b4c351b4719/ruvewuvo.pdfIn PDF document text
    • http://orhs76reunion.com/clients/30721/File/mowesemigewijokogaranasaj.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/19634035257.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090688b96df7---71542168793.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc624f21c---vipufabopodifuvar.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/b9e25ef2a2222c668593d5c5febc2957/51322060610.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e2bc0d979---vofis.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfe69a9c65---rozanidigadutamuwo.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/853594a8abe1495aaa268ba97e00e5cd/famunedet.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/4e57e3b63b1381b2d9b51b9dcaaf3002/66914601929.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210906_8B3AC7B53AABE18F.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/fegifepejujizato.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/velinumuj.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/78770514348.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/855ddf8307a388e883be34dcfbd6a25b/14429449195.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_off0000e563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE563 17496 bytes
SHA-256: 8b3994b0280ddc86279bfab8d6a5934b6a2d9683472afdb87d5b1ab68ac7984e
font_01_sfnt_off000112d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE9 11060 bytes
SHA-256: 565e7dcd4ea1d997cb80506c6d34950abfe4dbbe4b487f63460a743251c7d219

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