Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c438e33c27fa3f…

MALICIOUS

PDF

98.5 KB Created: 2021-07-23 19:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 60926e6df5f9a60828a02be29a767a2e SHA-1: 8b6b86722080e6811328e3ffb45ecc2eca5d0e7f SHA-256: 23c438e33c27fa3fdff350ea00f1cdaabb0627078a576aa13f6a8bec15a889fc
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms. This suggests the document is part of a link farm, likely for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, with the primary goal being to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://adabaskimerkezi.com/upload/file/92698819664.pdf In PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/6rh36b7e3jpbtbgeiebkfcda00/62888524452.pdfIn PDF document text
    • http://dade666.com/userfiles/202107file/2021070922494470554.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/cb85054e616f21bb81b99ce4bac61b3d/64066791797.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb5660c2bd---31449531324.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/6cf7e1491cff648e7d05ccbfcd1da7f8/12008545515.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/1obvnuen0uo215ikjh867turri/forixeluriviwigi.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec094577c6---bezejuxipetig.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/1a4457cf75ea11cf7e5aac92d2a0a151/jidamubagididifo.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ca5a3e0f8df---dosumitegesabunomaj.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/xizejovevamosolasibozefox.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/folugowefaribofug.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/64057235233.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/gjqr7gp23cpt9efg36atia5sjc/65521447007.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/geserufaxibijizowiwezijok.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/59559277422.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/23313584229.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/raroxosuro.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/8cc0e7ac6c0fddc55671fb5a1bf1ab8c/kudozogapukogejarelum.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/69526350015.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23f19b2f95---zejiwepixuvojo.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/0ad9841228853445f5f16d254bf0202e/kizimo.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/dibezuzotebuzawosoramemuk.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/prljk5jtk668pm6jeh5rp6kbp1/janumuseboxovarunafolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=galactic+civilizations+3+colony+guidePDF 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_off000119e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13200 10996 bytes
SHA-256: afd59d6038bfe0e686d36fdf12aa5df94373c5aa651367e59047360a3207c75d
font_02_sfnt_off00014b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B9B 17764 bytes
SHA-256: 99d1e3651b5c8b3be0e539b192cb8ea83020b25a7d8895fdbcb1bcb59f949605

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