Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c22ceb25180a42…

MALICIOUS

PDF

77.4 KB Created: 2021-07-08 07:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e31c5741612bc8b15998b13f270c9195 SHA-1: addefd0c3fb207914d12d38f23866ed6ac22fcdd SHA-256: f5c22ceb25180a42b982dc50d5a8f8367b41479c9cff5ac914e07aefbe0386cf
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of multiple distinct hosts and the use of UTM parameters suggest an effort to obscure the true destination and potentially track user engagement with the phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083924ee4415---lovegop.pdf In PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/39f2498d531f47da6a71ab8e44dbcc16/dofafinamisagizorazed.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/45432029751.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609166d66cec7---zonexijenowonopo.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/34335308589.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e4edf69e2feb13d1752306bfa3b8957a/wividodirapotafelisox.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/grcd2r9f5sa0o30sqastq86ru6/3499361424.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/nanilirabilaxineboxopapes.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/wenukajamupawol.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3db3cd4b9---74478908812.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/96375210301.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968e0d95e34---dezojenavunajulubasakod.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/33411836433.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/34306885031.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/t7prcq6foh2fmi1hnkq5iaqpst/suzisixuzemiz.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/37f405f8668405a842d45f16982aa3fa/xedosopox.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42506359923.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bf4322ed1---liget.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b310ca90b91---malimexosenupilo.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/dujujado.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3a161mrbjm530c211kdl20s2s6/66791730988.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/r9evop7ejve1v4h4j5se83cu1t/77582206638.pdfIn PDF document text
    • http://lawngo.net/fckfiles/gipevugotew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=net+force+worksheet+answersPDF 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_off0000cea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA5 10448 bytes
SHA-256: 213a3238c303c294453909314f1b2b1edb177a89a99edb4847e1b0a64c8f3acd
font_01_sfnt_off0000e670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 16312 bytes
SHA-256: af7a28d36018d0428cc5b2173134d97df41ab742e1280db3f415005a04945bed
font_02_sfnt_off0001107f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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