Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c50d1ba536a2b3e…

MALICIOUS

PDF

150.4 KB Created: 2021-09-02 19:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 88537244363459c48cad1f13b0101b5d SHA-1: 27910976c86fbc60f561ef6ca32148cc4a027738 SHA-256: 5c50d1ba536a2b3e91b11bbb575037739e4af681cf61a35ef66c4be765934cc5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating it's designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://fonnepal.org/userfiles/file/66213495497.pdf In PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161266f02c3ac3---29117865299.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/91136801601.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec51c7b128---bokaxo.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/tozekajalew.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb6fe12196e---32786948737.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/28468733717.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad195a5548---gewegojepiv.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/cdd27d56e5edd92d3890a4692db2030f/zulan.pdfIn PDF document text
    • http://scro.ru/pic/file/navugobavuv.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6bc159344---bamogemitoxeromumek.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/9n7a78n50ck6t31jvukfpr9l13/94046008204.pdfIn PDF document text
    • http://gyobel.itpublic/file/55288587610.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/4892d453897fb27628d31b9081679154/63016279245.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/45287985771.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c27b4cecc8---17036640603.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/8693bbcc55d35b69ab9ad3c57a4e7602/fiwuravenesepujomuxi.pdfIn PDF document text
    • http://deforma.it/userfiles/files/55545617817.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/sokajux.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/42885049458.pdfIn PDF document text
    • http://checopharma.com/upload/files/63494262680.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9dadda96e---48240205919.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/mivuxerulidejedimotuxu.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/26199616572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=unshared+sql+worksheetPDF 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_off0001e9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E9B7 18776 bytes
SHA-256: 96d6f101143ced180382af608fcc5b3c0412e2b31626a3bb768d1979ea3cedf2
font_01_sfnt_off00021b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21B56 10584 bytes
SHA-256: 68c9db8fd721ea86bb3d0791f6497c06da71e63b214308859d5f44055c900a70
font_02_sfnt_off00023354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23354 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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