Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b134ed90a3835e0…

MALICIOUS

PDF

84.3 KB Created: 2021-07-19 07:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 286dea4d78542344d0efaf9f49d6ffde SHA-1: 33672ae85c31f0f84bebe2d1b6de12e75a9ed80d SHA-256: 3b134ed90a3835e024639dee21efe6a8abf70eed5bb824a2f006b4bd0b45dd0c
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 URLs pointing to potentially compromised WordPress sites hosting further PDF files. These links are likely used to redirect users to phishing pages or download additional malware, aligning with spearphishing and exploitation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/hjlskjo10ih0l18jiirnjrni52/92063396166.pdf In PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/a753be6ba05e82e6f64f5b7d247d1718/dobutalolelerakukepikopup.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/89337559862.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d28b63efe5---62531892104.pdfIn PDF document text
    • http://evola.it/userfiles/files/43005854898.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/26105247339.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/1f6f5df40aed0a2ccfd8cb80911e2b8b/gowox.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/jivamadizane.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160735d716248e---goduzumukesoli.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a64e339cf94---wovotaxag.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/24943372694.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/zudawatikumokaxo.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder//userfiles/files/kugevop.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d4790aef91a---9678053271.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/8f9cec77093d908502b95ee608305cee/jorer.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/kiduwogajamamojuwexovozu.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/juzolalofiloxokam.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/padeniri.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/45345004599.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/lilaxukavajix.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c39a200869---wasepota.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/32786f470dbf4f7496764c0e9e3cfdb3/7867735917.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1a61bb7c2---pinopivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=dialectical+behavior+therapy+residential+treatmentPDF 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_off0000e74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74D 16484 bytes
SHA-256: eae23b741d7dea0fcbd024942111d973d9a26ae90372df70c5ff4bd9531eda96
font_01_sfnt_off00011200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A17 11100 bytes
SHA-256: 90ff2beb368fe66e3bd06d05172e01deb67d88575bf09d000de25878eba4d6e7

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