Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77a713bd1358ca4…

MALICIOUS

PDF

88.9 KB Created: 2021-08-23 16:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 68bff5cfc5ad8311a8873319ec0da78b SHA-1: 61a265d65c20571f7c3d7a699503f83f86c667a1 SHA-256: e77a713bd1358ca41661d1b4e3c2a17ea90bfef127adba20c024fcf0bfd320df
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://parkhighclassof60.com/clients/871169/File/16088259083.pdf In PDF document text
    • http://exteractif.fr/pictures/2/83236503687.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/zisepanudot.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/2992420934.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/72084529306.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/79674340613.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/46578329733.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/xituzakeforu.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/38050901957.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/63eae5d2b27b46f3bf72ed005dfdba5c/pidixedej.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/43162892654.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef459dae78---36221014673.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/14254517479.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d819665ba---41906966103.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742bed49012---begubesuxugopozenupena.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/9893a23dd14e1d415d8393f26d2285ff/xexuladazapodikap.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/vogurad.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/mowilin.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f56f491660---xorod.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc3c6cd2df---wifepujiv.pdfIn PDF document text
    • http://aurora-c.jp/files/files/kefib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=aa+thought+for+the+dayPDF 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_off0000f858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF858 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001106a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106A 17276 bytes
SHA-256: f348f70e55eaffdd7b384ad2e353335c61558f4a15efef51a5eff08242bdd449
font_02_sfnt_off00013d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D93 10420 bytes
SHA-256: 7bbb985ca881850404860ee92c079c6e80af928e541537373000d2c19f30492b

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