Malicious PDF — malware analysis report

Static analysis result for SHA-256 43dba7af93f3794d…

MALICIOUS

PDF

77.9 KB Created: 2021-09-17 05:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f145fd515cd94c5880301a835fe6f07a SHA-1: f29236aa02cfbbf883d06c8e98f16499b6b6d376 SHA-256: 43dba7af93f3794da88ccff8056892727a5bd986842347fcb89a466cd1de2933
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to external websites that host other PDF files. Heuristics indicate this is a link farm on potentially compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://zensushidanapoint.com/uploads/files/vaworajurosodujofexaje.pdf In PDF document text
    • http://fongyoskert.hu/userfiles/files/suziduse.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/futixofugupakizeguke.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/xaxizi.pdfIn PDF document text
    • https://togeltop.net/contents/files/88442571435.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/remuvuvuwewideloxemifi.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4ee585d51fd2b61e4bf0618e770759c6/nuwob.pdfIn PDF document text
    • http://lagrupacio.cat/file/88153397797.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1631469045.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/28660912434.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613719f70245d---54790882498.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/wukiroxawugu.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/najibet.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/t9ujcus8kifmgmrqa7dbfp60v2/62439195018.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/62216701677.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614045b74782c---31287130993.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/27079012559.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/80315989538.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/vusunapovisonaluwigu.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16139a8a08551b---pofofopikunagoruwumek.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/dagebudiva.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161410dcec90bb---79498679183.pdfIn PDF document text
    • https://pellevah.com/upload/files/71913437048.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/57109944464.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/11082146954.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/lotux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=movie+chal+mera+putt+2PDF link annotation
    • 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_off0000cc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE461 10644 bytes
SHA-256: 37ebf535c87dfa314c800f520ce6f0f63d4729ae4ec9c1128d3728da91ca1922
font_02_sfnt_off0000fccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCC 17360 bytes
SHA-256: fa3da2f0d349e7cf5e91c9e11f16fc1ed575d33347bc852caa81556f1db69e0b