Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd7228aa72e936d…

MALICIOUS

PDF

73.4 KB Created: 2021-09-05 10:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 64c7ddfe4476075e9b0af2c639b11bf4 SHA-1: 1cab7f4f3b8ef75bb136ebd56de415a3a50fafd6 SHA-256: cdd7228aa72e936d0ec7d4fde41dd933635a8f5341c67a23e218f3c38ab99d99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong intent to redirect users to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://nomylo.ru/uplcv?utm_term=phytochemical+of+medicinal+plants+pdf PDF link annotation
    • http://logansport1971.com/clients/4/42/424235dfd0fdcd2d3cc2afd1e16bb83e/File/xipelagenigutiraw.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/moseriditin.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/kabuwam.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/28531482723.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/d6168d88a932a66ba87f08e6876831b2/momerumorogaxape.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/tonowenepeduno.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/ef6f94af61f1d8cef3a15ee53cc6534d/funotom.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e3cb08f5c2---xakeruxije.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/kakogazipulod.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/89522741836.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/rajazuj.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/ludiguzu.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e0c2cfcfd---vukokavufa.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/82602082845.pdfIn PDF document text
    • https://angkagenap.com/contents//files/98377727780.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/63551491155.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1608beeccaf367---gelozotik.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/35304892026.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/3h8f5ha7l02d1u95davp40pqbe/duwuwepuxotupoma.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/nuxopemomivusebewomibo.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/509147b8a457ef8840eaa6af1b9e05b3/munilulowumumezexaw.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/10523720124.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a15d232a2---4291348160.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115565a566de---30882864028.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/zozusiwiv.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f939fd6bad---87689335087.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_off0000bbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAD 16640 bytes
SHA-256: cc4a47bc0dad37983eed03846551cb1fd15b69b34f968451a2389752f04d4f5e
font_01_sfnt_off0000e66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE86 10900 bytes
SHA-256: 6b0c4f7ccb0c4118ddb132abc77189122f5cc714d031022eb9cb1340ac8a96cc

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