Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5927dfef28b0e9…

MALICIOUS

PDF

80.1 KB Created: 2021-09-20 16:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f54debb8137bda9c9c6cf8123f523aee SHA-1: 6f84ea7f8fa795b30469ff82907d20d813295f9a SHA-256: db5927dfef28b0e9a18306647caf0ebcf44de115bd13dfc7a552fb62086ab87a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites acting as link farms. These links are designed to redirect users to potentially malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://philabc.ru/uplcv?utm_term=vlc+player+apk+indir PDF link annotation
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/d0bc250a1a9bfd35a47ac0426626172b/mubogitajolex.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/2516242774.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/17637922363.pdfIn PDF document text
    • http://195exim.com/datas/files/xabagopawizametoge.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe6221bb6a---likiniz.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/lupawefijenenokinonuvu.pdfIn PDF document text
    • https://projetovm.com/uploads/files/rosav.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/mojasawaxenotuj.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/dibofefitujowitifosal.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fa5cdcbd6---kivaribefak.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210920184443.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/10610031003.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/25835784520.pdfIn PDF document text
    • http://web5gstore.com/Files/files/kevuvovemumal.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/jopiraso.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/85673177224.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/aeebe83ff08ace398a3e697e070e49c1/34222633327.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/zabiwivekowezasise.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/83111381309.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/vifemi.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/e6b08b130c7bdef6ed25f724ea551ec4/78022001314.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/62629596599.pdfIn PDF document text
    • http://friulanapanini.com/images/file/gujanowegolurawidowid.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_off0000d658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD658 17596 bytes
SHA-256: aa51d0d9572830652dbba0fbbe435b53240b11eb0397d611c28df276a816bfe7
font_01_sfnt_off00010389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA0 10296 bytes
SHA-256: 3d1dc6a9ce7f093a50afd3bfbacb5803d707ecc3c428afb4a225a8b814b6b05e

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