Malicious PDF — malware analysis report

Static analysis result for SHA-256 739d42a937a4be4a…

MALICIOUS

PDF

88.3 KB Created: 2021-07-15 23:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 12f70a24f3fcdfa5b36fb152b512264e SHA-1: 32ebe423f9a40ee9e7716fcba4a59cf366196595 SHA-256: 739d42a937a4be4a42a045298cef8bc40271df9b32a97e640d109f341d459444
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, containing numerous external URIs pointing to various websites, some of which are hosted on compromised WordPress uploads or disposable domains. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common vector for malicious PDFs to execute exploits or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://kawanmto.net/contents//files/vibekekatelaremajewevavu.pdf In PDF document text
    • http://syuncyoku.jp/upload/file/totelurezugawodogar.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85a3cc112c---37439849391.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/xomod.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/lexotamu.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/100aiegvgllkp6p0k5k5hpb1j5/27587504453.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074260a8c7a3---54281115010.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd980e24d07---14378048701.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/xokaruxebowomanevo.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/zitexejovoriwuwu.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/63550080868.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160705ef13269c---getoguwaxix.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/dafifapejur.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/faa46690f04d1b5d07338784f9147c93/33402287883.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/t2c9bptp75mrl259l4l6qt0iv6/figozi.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcc174e43a---domolanitovulelib.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/740106dc572dc63b8d1c13a7afddf9f2/97074123275.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8115978e61---40994447855.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/fmn2snn70a06p4p478eg2ig392/81483114521.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/47991599818.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/vugovuwinilalejeditu.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/suzujol.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/488126493178054dfd7d04355434e148/tasanuginelolikepisug.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/salanepexixasovesejel.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/nezor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+put+a+curse+on+someone+in+latinPDF 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_off0000f487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF487 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9E 10712 bytes
SHA-256: 78e973c49ff81714f8e0b783daa907ed485a58b044049285164c07d3a7c8d95a
font_02_sfnt_off00012538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12538 17984 bytes
SHA-256: 73e6463f7f7be50249bded7495695b327456d511a13d949e616d36c0125c0316

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