Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d9e073a977c4ea8…

MALICIOUS

PDF

93.9 KB Created: 2021-09-01 13:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cfc53937bf44746da51b0c51839c3af8 SHA-1: e96a5144e88c7ccd6f9ab253d2045ba2d6425b39 SHA-256: 9d9e073a977c4ea86de7f2febecaf19c10d4bb9d16da69d23efa3d3a825e4a0b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by an ML classifier. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong likelihood of malicious redirection or content hosting. No scripts were extracted, but the overall structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • 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://crewmak.ru/uplcv?utm_term=colors+according+to+days PDF link annotation
    • http://corporatiegids.nl/uploads/files/vevuduzalisezefuzijexu.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/qq0v32ebbfo9lbilbr8n273t73/menasipupanogijemimivekek.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/firisuwapejemeruku.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/noget.pdfIn PDF document text
    • https://empirepin.com/calisma2/files/uploads/tejowi.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/bizadamuxidam.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/93806517105.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/2fc6eec7bc57d8460dd099f5020f6b4d/kalizoxujazenozig.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/7984d68bbd1aca8d61c15a11a753cff6/lidovupozojunog.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/43c3d396f17d11377827b293e35885e2/89803782120.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/hg905ssqimbnikn5ttc76aotnu/60080557271.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/86994317969.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021062706114458.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/18933123924.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/74950489953.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/90450314911.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b575706f032---nudirejikisonamadubi.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c70ab35719---60216873495.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/bfc5998a85ff9407926fbcb503ceed58/dufopajofajapi.pdfIn PDF document text
    • http://kotolantopeni.cz/file/37184087500.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ca37b520a4a71d83e5be2357bc8f3df8/zijorovajoziketopi.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/80100032780.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/37s2g7gsgvkmdaqvv3m178f2jt/20490863986.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_off00010cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E8 17536 bytes
SHA-256: 414e7d10ea91fe2baab92ad6a3eda793192a5dadedd74fe43af0800189cb84d8
font_02_sfnt_off000151d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151D9 10556 bytes
SHA-256: e7eb6a837fcee00ee155ebb9d0df536b6c3947bdfea57e045a75b21245474424