Malicious PDF — malware analysis report

Static analysis result for SHA-256 0937a745b1ce0bdd…

MALICIOUS

PDF

154.5 KB Created: 2021-07-24 06:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ad020adf6e861279d0a38fd4ba22a915 SHA-1: e57cf427b497a2f259696610af132a584584db3d SHA-256: 0937a745b1ce0bdd7e58c506e4798411f815e5733c81ed1fbefd3f9c11025ca7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a link farm pointing to various PDF files hosted on potentially compromised websites. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates that the document likely instructs the user to open a password-protected archive, a common tactic to evade gateway scanning. The ClamAV detection and ML classifier further support its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9750

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://lueckerreunion2020.com/clients/e/eb/eba09433058400eda594a485f9004317/File/80283322827.pdf In PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/3761429965.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/folikorowawaxurubekolosu.pdfIn PDF document text
    • https://afayl.com/userfiles/file/japujefu.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160719283edabd---litigalalevow.pdfIn PDF document text
    • http://industra.sk/userfiles/file/94895578729.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fe2b74cd9---nipefekofuwonaxos.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/81b66e0198288feef79bc0ab07392287/duwelifidudupeziremuviw.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/fjer7mitq71r34cmbme82k60b0/67858679379.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a991ceaa7ae---gazona.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/sotulokedolatozevogoxame.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/27509524596.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607adcfba7735---1987847433.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/021e844ca2aee90b912e07dbff33550d/81737819359.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5bd580d39---kidararewimejegafi.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/84646499997.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/v99au19u40on3ui08qlvvvacsg/lakekani.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/2766dcceb113f6bd447567daf21ec1f1/87232992023.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb10aa7d15---vojujutezezomapax.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b941414851e---68887860203.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/4789025982d4839e255955e82e2b14e0/tawezelefenodilivesive.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/282df50gr0ivlh0o2ac1hkqqlp/73610415152.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/95846247906.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfdde8325f---94547318361.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607355fc1c0b8---40341019239.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/95b38822957d450b51a693f8d971045b/97661216255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=descargar+libro+la+meta+de+eliyahu+goldratt+pdf+gratisPDF 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_off0001f6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F6CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00020ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20EE1 11316 bytes
SHA-256: c7ea8937c8acfb41bc3cc27945f0a50c1fefbb0719ff82597f44aca578bd5fb0
font_02_sfnt_off00022920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22920 18580 bytes
SHA-256: 069105447e01bbc40964c0ffca758789ec5a49071d96a9bcee077cf1a60943d5

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