Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f98c09041c41f4c…

MALICIOUS

PDF

78.7 KB Created: 2021-09-08 12:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3e29aefdc536b579c531855b7323f132 SHA-1: 8227f77b5b40699f3fa56ff54efe05ab6fefe053 SHA-256: 3f98c09041c41f4c442e448742c082446056c99f79da8d509b154e4456ecefc3
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristics indicate it functions as a link farm, pointing to multiple potentially compromised domains and disposable hosting, likely to obscure the final malicious destination. The ML classifier and ClamAV detection strongly support its malicious nature, suggesting it's a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=free+tracing+lines+worksheets+for+preschoolers PDF link annotation
    • https://worldmedglobal.com/userfiles/files/ribuxadadag.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/18046bb18883effe169324cf263fbfc8/58093593870.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613870ec8a1c4---52971693338.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/gekupuk.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/79171049033.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/6752786744.pdfIn PDF document text
    • http://biosite.ru/images/news/file/mofobixomolizal.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613447601143f---50032499618.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/xidufebakijazevade.pdfIn PDF document text
    • http://fnathservices.com/upload/file/14143160874.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/54048574384.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/54064496484.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/67972758950.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/61427822705.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/zenusesafovapovura.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/80276955553.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/53199426816.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/fafiwoxakexa.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/89329285663.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210903064613.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/gelesofidekuga.pdfIn PDF document text
    • http://kuraniterbiye.com/resimler/files/55840661093.pdfIn PDF document text
    • 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_off0000ce67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE679 17640 bytes
SHA-256: 987f9c4d10fc24e8a1f2a096caefbfbc72e707624e9a904401b647bdf045b8fd
font_02_sfnt_off00011410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11410 10912 bytes
SHA-256: c6850f0dac893143ddb1e120d20d3b1f8fe405913eb59f64d53fad60db5ac3ae

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