Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0ad02ffb7695ff…

MALICIOUS

PDF

83.4 KB Created: 2021-09-04 19:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d0a51ed35156ac8496662a6c4267021e SHA-1: 8351181d715c294b90ccef1e3079e1e2ae567a42 SHA-256: da0ad02ffb7695ff2cea68cefab242e255ca04beb0f09fe00e4385942c2762b9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is unreadable, but the link farm heuristic and the presence of compromised CMS upload links are strong indicators of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://carlojans.com/cms/file/77705825688.pdf In PDF document text
    • https://guapa2.com/admin/fck/file/nezak.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/gekejisinupili.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/42634642795.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/nujumavudewogalub.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109021732243062.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/66801882138.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/19319132759.pdfIn PDF document text
    • https://raljob.com/userfiles/file/mebujomipebipino.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/wuduwixoxugawazigodimu.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d5d88ddef9---befunodowononoxebile.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210721125954.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/talabarotabemigixeluter.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/11141903130.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098278105069---wukatemika.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855df4e358a---votagudizejaruke.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/73993696792.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/692e16b61dc7c537ae1eb1f9c339d772/49137022225.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/102dcc20df6ff46a3425cf98989f989f/72974153190.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/18977929777.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/14467215699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=bengali+cookbook+pdf+free+downloadPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afba90f41cb---41280561093.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_off0000d810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD810 21104 bytes
SHA-256: 64e171af8a203acb57f14246645c7bb8ad3a5c2397f84edab451ea0afcaaf689
font_01_sfnt_off00010e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AA 10900 bytes
SHA-256: ce3dbf017fb030d3f4022b1657ec90466396dba79cefdea3108460e772f56939

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