Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b408af06be648fb…

MALICIOUS

PDF

88.6 KB Created: 2021-06-26 02:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b10713dd76c7e9372c03944472fdfa56 SHA-1: 3d55671c2f7f14a7aee8d24e3eb7bcef44968960 SHA-256: 4b408af06be648fbceeeb61b69e7564b8ee21089af5891e6fa11baf633cf1684
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports this, indicating a lure to trick users into downloading a payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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.
  • 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://synerhu.ru/uplcv?utm_term=way+maker+spanish+mp3+download PDF link annotation
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/bcd7804f1583d3b9c693c430dadcf457/89020603710.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/20870679092.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/5149ad51653746cfe37d76a2c810113a/30644019273.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/c59ed0bc55e9af5bcb8ebaeb1ee6f5ff/78512011409.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160942c6664a08---89787199889.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/bogoxewe.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/80318475961.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/57baefa06f557babf8a90cae8e77e61d/nukakazolopozeno.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/tagales.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a737c99b488---98504953112.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/18227157739.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609417b6cda24---88156237675.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d52e4bcf6---sutamuliwubozerepux.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/896bbtv37a361f484hr1d55g02/41172069589.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160984d07d75d9---54765191835.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f881bdda9---10881927751.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/643e4d50c7fbf98f17fc258d616dfc52/23359191230.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/fibbkbbtqhn71bmj5tnavof0d4/kirezedimupir.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/6fc650e1902bc6dd7c19e032f2c3e25d/52484028110.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8fdd649fe6bce4623c3128b059c27fc1/tugiwapejujopilesobugexo.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609afb5554141---65852025963.pdfIn PDF document text
    • https://koratspring.com/upload/file/kenikanemiwi.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/f8e5ff9674954f4fa2ed6d14cd95d513/lojenoxikogonimuwotapuxum.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/5cc4c7e72347d731dc5d7d506a140f70/kesetofivesibedudulupav.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28E 11016 bytes
SHA-256: fb7ed98e964b8092a087846b8fb244e7a996334e5e4c6d49fbf7689edd87141c
font_01_sfnt_off0000ec02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10414 18816 bytes
SHA-256: f434dd8b5403b311ca721ba801ee94a1da6fa4c18b95d90d40352365263f0ec3
font_03_sfnt_off000134c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C2 18776 bytes
SHA-256: 3ded9aaca2ef9e6c6e95cee9882111b9cda0db582afcb602817e0619031ab472

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