Malicious PDF — malware analysis report

Static analysis result for SHA-256 152c274a6d0d41da…

MALICIOUS

PDF

77.4 KB Created: 2021-09-04 23:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1eef7d0871168e32ca5fb0e0c097b030 SHA-1: be1b04d39c4169f723408108b7c4092bac6476e1 SHA-256: 152c274a6d0d41da31853532522b123550375483efd5f4670a33e4dcb0868e36
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The primary attack pattern involves leveraging these links for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/ba925b4da153776ac2ca8592f9be923b/venakapu.pdf In PDF document text
    • http://cs168.tw/upfiles/editor/files/70047151507.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/mexujafexetilewagurajit.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c569b0afbd3---zalojavagil.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8329c009da---33615385176.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4a258ba30a---96918346543.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/43139585512.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/ac37a382f32e9e89041f22fd74a4299f/vudizopajujigefilokedat.pdfIn PDF document text
    • http://roocenter.ru/upload/file/6891529890.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/favezotabiluxunumulenen.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/144329b089ebd0b0854e955a76b4f43d/fejexurokitiforot.pdfIn PDF document text
    • http://sgpeo.pl/users//file/83897574997.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/47a58cglsbqm5tmebi08sttge3/zevikesumazuw.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ce4e3c04b---67686960803.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/begix.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/4ca5176a03ff72c57513a63ce5fe2f7a/93041074486.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/pelexudorid.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085abdee9088---93809394964.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c971b47b70a---ditewevomowipofumowu.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99cc43686a---ziforido.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e01557ee6eb---wudolodemopikugazefatutu.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/lrj2rrdl6hhrnt5cfhas2ldup7/547605593.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/vafewagekokijorapozolixo.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/b5e3a0746df86102a0c76afe67f21632/65122922913.pdfIn PDF document text
    • https://taperagi.com/contents//files/jamurenalagozefepokegam.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/83329050133.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/23956296663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=dicion%C3%A1rio+espanhol+portugu%C3%AAs+pdfPDF 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_off0000c4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DB 11340 bytes
SHA-256: c968e2ab0183c040d9fc2e2b0fa73cc6b6bc5a76cac46d10c561282f1bf67ddd
font_01_sfnt_off0000de9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AE 19100 bytes
SHA-256: 19d49982c6ab2d50653153dfdf96519855b27fb08b85cf3f95feaab885c193c0