Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba722406947ef6b3…

MALICIOUS

PDF

88.5 KB Created: 2021-09-15 13:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b72b3eab2beead9b67a0312e990579a9 SHA-1: 56e2fa5ddc298f738e5d4ca2d343619b84699621 SHA-256: ba722406947ef6b3eb725ab7bd30620f39a39baf702911ff3755b374e6c0f281
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised WordPress upload directories or disposable hosting. An embedded JavaScript stream was also detected, suggesting the potential for further malicious actions like redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://esz.jp/img/editor/files/muxofafomakikabebulix.pdf In PDF document text
    • http://soc-in.com/data/media/files/fetilonisivorubiwezelurem.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/lebizes.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/28730102639.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/e54fd94e5f93937fb80abeb4aaff720c/70991773528.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/28540888530.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090823185871.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631008337.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/nozisafabufi.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/70325851892.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/61779646600.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/24ab1e6c979d2e689439fa3da83c6490/xomupiro.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/e51d6f6a8f65baca5055096622ba1a68/16458065122.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/bulama.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/fazovixixidotidaruvu.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec6f5400c0---9109089516.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/lotezixesafumatirefudo.pdfIn PDF document text
    • http://master-br.ru/img/file/guwuxavonewizukulozojat.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/80080b185441627ab8b1137bab3b0694/42596457139.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///modudigo.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/88503595833.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/53229204211.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+change+homepage+on+chrome+androidPDF 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_off0000f59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59D 17856 bytes
SHA-256: 8bfe87a40c0887980b8ea656a4410ce249874eecf7381f33f9b93786117383e4
font_01_sfnt_off000123b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B6 10824 bytes
SHA-256: 333429e2b443d451841901fc63df30c58d9253a7985ffa432234a8fa927002e8
font_02_sfnt_off00013c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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