Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5325bb4128eb987…

MALICIOUS

PDF

69.5 KB Created: 2021-09-26 03:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 92ab8f2561751ae2dd21e1a359ac1962 SHA-1: 270164033f6e8e0c5a542dbc3f3378dd32cc794a SHA-256: b5325bb4128eb987ed563df62dd6889c2426078cb82c28dd7a66db30b571bb57
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/de3s36bicssirhtididm53clr5/wowotolijabuvimazaj.pdf In PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/81045138254.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/58964689046.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/614f98aa8d1ab.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/83651562383.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/nuvade.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/33124475530.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/8896334159.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/jopujo.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/merakokexotap.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e8328990c---gosulifo.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210915210426.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/23940020822.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/25813236911.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/80280074542.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/sozevukabazafinevozugo.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ce9d4c73e---bepinoverusaxefaminal.pdfIn PDF document text
    • http://domuran.pl/files/file/39948161409.pdfIn PDF document text
    • http://hairandoil.com/uploads/gisiruzaxifesejut.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/pitosomabifolagazisotup.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/8cohlkja9lm9ectfsalgsu8ks6/18909947579.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/waxoju.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210920021107.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff7e720c46---63610764150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=android+21+gokuPDF 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_off0000b388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9F 10160 bytes
SHA-256: 3426f97aa8b59fe30f545a2843d4b1d48878f772ebbd898f23792949d0411435
font_02_sfnt_off0000e249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE249 15124 bytes
SHA-256: 8cb4c1f7e872063ea3d37a6baaa2279dbae05488907f7cd097210e3e8d686d87

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