Malicious PDF — malware analysis report

Static analysis result for SHA-256 26167851fdb35a60…

MALICIOUS

PDF

74.4 KB Created: 2021-09-08 21:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e172adb7e6951cdcd4de6ad0880e73df SHA-1: 06b1886f624bb8ddc21118f74f4a511165626a51 SHA-256: 26167851fdb35a60b3613c0eaa64ea54f9ddf103a8997224d5f094ad80efe2b8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, which are often used for phishing or to download further malicious payloads. The presence of multiple external URIs, including links to compromised CMS uploads and disposable hosting, further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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://searchlink.org/userfiles/file/32317931226.pdf In PDF document text
    • https://birsamundapark.in/userfiles/files/7373038494.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/lakutepo.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/donuborem.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/gowideduraxeluvusodavebi.pdfIn PDF document text
    • http://belloverde.net/emailer/file/tekidodumesikedulu.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/nagejigu.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/58836112333.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/xefezetexigudevalakis.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131743b52fc2---37147492364.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/kixawa.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/tebipi.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/gewatelejun.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138f6bdace35---2193243448.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/edf79db3236b8e88388626332dd9a4af/gubatiwuro.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/47226551918.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/nudijotisupilivadedofumes.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/42615464030.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/gazajufujawijon.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/jeperile.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/57068325001.pdfIn PDF document text
    • https://koratspring.com/upload/file/sadawilukoriregetoxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=unchained+melody+ukulele+pdfPDF 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_off0000bdbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBB 17676 bytes
SHA-256: d787d7ba869f7d8f5e9179dd0db04f6058be80c07da6bade61c296b5b8f9b89e
font_01_sfnt_off0000eb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1A 10832 bytes
SHA-256: 29584f793f39026a727356124c3d924b31381d222fd3aa2816b55ee4505c2d93
font_02_sfnt_off000103dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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