Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c57063ae5b6cec…

MALICIOUS

PDF

85.6 KB Created: 2021-09-12 08:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b4cc9bd4746bcd5cdf96f6f32a1a5474 SHA-1: 6ad9e28c27bf4a126b0721aef8c955b7acf40d3f SHA-256: 85c57063ae5b6ceca532e23b3b536e59df2160707b331fccb975c6f145df2bec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=how+to+transfer+music+from+android+to+pc+without+usb PDF link annotation
    • http://www.farmaciapenil.es/userfiles/files/87250235226.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/mazizufedixetowizazul.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/vejaforagutovosamorafoja.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/gakerudifeg.pdfIn PDF document text
    • https://nobelboya.com/userfiles/file/68992727068.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/wuwive.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a75fc127057d6d4bee98f4d2b92ba540/kuwagit.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/8246118041.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19675362090.pdfIn PDF document text
    • http://dkind.net/userData/board/file/29000457197.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/41652760302.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/65904023067.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/bd7de5f18806a5e0f4af74c2bf949f83/26025172278.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b2ca8ce0ba451a7a939fe742db153bbf/tevexalupotor.pdfIn PDF document text
    • http://spakimthi.com/upload/files/64236783658.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/gugeputixiforiji.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161366c4ddfd24---47160943887.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613108148838a---53780058768.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/269287236.pdfIn PDF document text
    • http://xenangheli.vn/public/files/lemeruligizuganaged.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/11697274692.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/guruzakusokirilomaku.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/65402796839.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/bakisovimezi.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/saxukoxaviji.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_off0000e9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A6 17244 bytes
SHA-256: 0987a1c81f95120d0732a756bb38c51ad2c03175450f4ee563e09aca9a51313b
font_01_sfnt_off00011667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11667 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7E 11156 bytes
SHA-256: a831983eb020bbeb2e071f1f5d3fdb4a93ed509b29ff570135fc286b64c08de1

Open this report in the interactive analyzer, or submit your own file for analysis.