Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e87dfbb02580ba7…

MALICIOUS

PDF

90.0 KB Created: 2021-09-09 06:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 27e4831dddf84628f5ec2e4955b506f4 SHA-1: f2982cc24b1461b5ad7d11ad9f080a67e9f7ac5f SHA-256: 9e87dfbb02580ba7a4dfb2efb5af87a275ba828ff50066dbc2bfb0995a1d047e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=indian+idol+2004+winner PDF link annotation
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c5a2f3bef---jaluxigupevawo.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16137fe31bce97---dojilikejamu.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/29205706536.pdfIn PDF document text
    • http://dd-eng.com/files/files/81113971097.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/83877176006.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/3560575523.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/244625525.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/podus.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/86904646552.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/zinulifojosisisibodotun.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/82742214518.pdfIn PDF document text
    • http://www.grifin.sk/files/veterisanowot.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/daronifimufowaxakajakig.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/bajesexaxisajexifi.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/bavunoromububoroba.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zosigilamevewarapibubupi.pdfIn PDF document text
    • http://workontext.ru/media/file/ributiko.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/88649240226.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395989b5cb3---44060913110.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210904_142457.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/vogokapasa.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136fca0ba0a5---46393858222.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_off0000fade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADE 18596 bytes
SHA-256: effefe899b6601c43417c8d50ec634c81439c4c60c4be9356231e55b7b11615b
font_01_sfnt_off00012b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A6 10332 bytes
SHA-256: cf97f9e89002e467764f2a68571322520a3bb37bafbaf4c02f60bfeae318c06d