Malicious PDF — malware analysis report

Static analysis result for SHA-256 132566b6f3161995…

MALICIOUS

PDF

87.8 KB Created: 2021-08-11 10:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9d06232bc4b3e9c78930d5bd07f51f67 SHA-1: 5fa90e7de971db6f329105f0f17a23357f515400 SHA-256: 132566b6f3161995e2684099a98fe1c39813665cbe01da709900c04205a62ae9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier. Static analysis reveals it functions as a link farm, with numerous embedded URLs pointing to external sites, many of which are hosted on compromised WordPress installations or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such domains for link distribution, suggesting a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/l367ndthso1oo2mbonrd8l975e/japugemisipenegus.pdf In PDF document text
    • http://natpuedu.in/userfiles/file/podefozilitezu.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/juzudazuzizumudo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607583c8f4059---27012457603.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/dalorej.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846ea9bd026---noxupapijoxitegoka.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/1745295006.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7cb3e4c2d---gakijegewam.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/2k2kd9aif1k6nih8n8v2jc883i/tofosul.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/146fe4d9fa95a77135713b9e5637cb28/bizumewe.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/rikimiz.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/poxumabisifogeduwovel.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c8ee584e4---ludixesibadokojigud.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/meboduwamudawerabis.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d901ef956---99523866796.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57c6c3fbc0---goluvarasesuvol.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/dab13e69ee2848d995af190eeadaddb5/41085904412.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160769e1f0c570---kolujovu.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021050123060430.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/59542061312.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c94c0a29b05---99856408297.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/winile.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/63832920783.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/51d1c489e96d30ec54ea9bbfdbb83a3f/fajoximigonikopoxategoma.pdfIn PDF document text
    • http://jn-zhsc.com/upload/dimilatafumaniwataduzite.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ho5qrbl2b2d3stln5ca6bo0cq2/wudoxuxudaxemirotijiw.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/54882747336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=http+get+java+codePDF 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_off0000f5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B6 16868 bytes
SHA-256: 3e6e90116d2e88c21e0b64489bb83512198d06d03f9f0fb18ea84b85d19f29cf
font_01_sfnt_off00012215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12215 10364 bytes
SHA-256: ea31ab11c6c211c2372c58c5a1049c1354178cca06314ffbf2e7a624d21fb51d
font_02_sfnt_off00013971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13971 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1