Malicious PDF — malware analysis report

Static analysis result for SHA-256 7157c928f6bc1597…

MALICIOUS

PDF

83.9 KB Created: 2021-07-21 04:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d075503aa307b63dfa5c075e314de3a3 SHA-1: db7e739165ffb220b7d1509c245b59cfcc625b6b SHA-256: 7157c928f6bc15977f80dc51be595c63528c0784b52b7744aa005bb27fc47aae
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The primary attack pattern involves luring users to potentially malicious content through a series of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/wajitesulipubot.pdf In PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/4pm4s3vh7rmhsbadko728300uj/88981476575.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/0d8edpe3acvhrttvu2b6u8ngq2/94433555787.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c22ec4bd33b---bexomixebojebiwavufag.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/96868174769.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/58150387509.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/0eeb53f2630429784324892e89091ecc/933606162.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b526a81a7---lemamam.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/87553386416.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/jelizekujikematezuwidow.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/51883085938.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/wirapepotusofi.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/zofowinatexaburenirofi.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a93018084---tonirobesu.pdfIn PDF document text
    • http://mwcapital.net//ckfinder/userfiles/files/11569916717.pdfIn PDF document text
    • https://aedwea.com/upload/foto/67841056810.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/46231414701.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/a814b15c6ab7c3db37980cc53944f59a/tejuxe.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/32475234496.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bcc6e404c---15161605857.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/zivag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=5+acres+to+hectaresPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC864 1780 bytes
SHA-256: ee6d8c25003eb2de61ee1fda640ec7b8e4605923364b71ee832b966c85f0f81c
font_01_sfnt_off0000d0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D8 16284 bytes
SHA-256: 3a4e3295af537b333e845f8c0d6a49b6a529eb37e3d859f6769c134c07a01f5d
font_03_sfnt_off0000fefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFA 10120 bytes
SHA-256: 8541425c5bee460e00f99a1883951a913cd3b88d29b1022a90021c3a9b8b646b
font_04_sfnt_off000115c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C1 16908 bytes
SHA-256: 292066a0c0ef6a5ac8f04504f4b68432109efd9f3b6d01a0a36580831c184520

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