Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1d69e9bf9e7416…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 16:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: cda909ccd8f72e77c2307997381cca38 SHA-1: f115a9c1364582fd59b6976a4f2bd0de2b39c373 SHA-256: be1d69e9bf9e7416d635060eb5acb739937787c3c437a903af8aff6e615e6254
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains exploit code or phishing content. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites hosting further PDF files, suggesting a multi-stage attack. The presence of embedded URLs and the nature of the heuristics strongly suggest this file is part of a phishing campaign or a malware distribution network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/7hvdu6kc6j8n8sj9kqo09rk03u/xukamovawitowusejego.pdf In PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a157875983b2bd628e9d2cc224399586/62966539323.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b522528cab2---wutukofib.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/d1f1456b78e07dcec0c8906355038584/kejaluxalaraj.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/eb119981c038b2bd72bf2e464eb397fc/zilizurokoni.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/39690719839.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/65209635705.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/8932318903.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/zowixanagagozejalebetop.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/45fb56d7ba6c2a75f90d46d79ee15038/jenilitalobafese.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/c649dc6edbe6677da20f82da5d0f2940/jujidokugos.pdfIn PDF document text
    • http://mamitobe.ru/files/file/zalamelotaxoresabodelotoz.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/vaxewaripij.pdfIn PDF document text
    • https://tavio.ru/files/file/43818175026.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/18094374950.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/74476796505.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/98547875240.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/kivedifakazu.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085c16b65b9a---pebisilaworofatozesekozi.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607082ce41b2c---jopadevepuwipoworifuwefo.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a4dbae6a9---rakajodavelezo.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/perofafimafojewak.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210816103508.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/ac1856a9f4e0338e8cf34417f87b7a03/wazijuvesomu.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/74473527056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+way+you+hold+me+hold+me+hold+mePDF 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_off0000e0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FA 17376 bytes
SHA-256: ad9fb901521d17fe204141844864e5aebb292671cccbd0a38e2172e40da35217
font_01_sfnt_off00010db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C7 10212 bytes
SHA-256: eb6896ef2ca9ee2a40a5c6b3cd50297929a6977fe685996a0fa1908c03a9ffd8