Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5fb603d3814742…

MALICIOUS

PDF

75.2 KB Created: 2021-09-04 07:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d8c6eb89151a7898178853080793f242 SHA-1: e500c059b6acc551f1c20cdf1ea2ccdcb7a60679 SHA-256: 1b5fb603d3814742e48a691a1df1bbb8a20637bf6fc7ad429ac6ce72c3264a97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and links pointing to compromised CMS upload storage and 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. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=3000+most+common+english+words+with+meaning+pdf PDF link annotation
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a73862cdd0c---5810722203.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab0cad64f8---nesufaledofodegafo.pdfIn PDF document text
    • https://areicon.com/images/file/86369417263.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/9671158e64241dfbc8586284f68e51b6/50359587262.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/89444650004.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/finulatata.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607693ec3c8a8---69114917454.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/fibawatimukidi.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/t9ukc8mgksma17ttqvo9siuoo7/72360272552.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/supidabidexalebamugovo.pdfIn PDF document text
    • https://bursac.net/userfiles/file/62434513451.pdfIn PDF document text
    • http://xsteelstock.com/d/files/kigeriruminimojujasob.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/wibamiwamix.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/68523159494.pdfIn PDF document text
    • http://anm-av.de/uploads/files/22686243062.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/14794756257.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b7463e008a---63285440156.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/jpu6slo79135jqpht4nev63lv9/rewapenebawinitujesibo.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/kigaxote.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fff821f83b---valotelebetufirunota.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/gedinogatukidax.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/gepodupufixujobemunuxudin.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c55a09f4389939cea4ab05b1686f60dc/kanenowa.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/ed9fa1871fca4655ecb6a33d95b9f6a5/90074731426.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/57el9kc9bog43g8tbdlfkthcc2/wuguxolupunazakugofetut.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_off0000c19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AF 16828 bytes
SHA-256: 3405de66f4a08e79e8a3dc7987f72e4c71c9f26a36284f02c22f7e330dc05829
font_02_sfnt_off000104af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AF 11348 bytes
SHA-256: 99bf5146aea1fe6de6fa70115434f4f830bbdfca1a489bcfa5dac14432f0bdd1

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