Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e2f4a887d120f63…

MALICIOUS

PDF

81.5 KB Created: 2021-09-15 20:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a99e55929a88d4a1defa7e1d11fb2449 SHA-1: 045d25cb29c128ea27d75e859dc8870619e4ac25 SHA-256: 5e2f4a887d120f6338aaf94dc8c9368596c28d8deb0cd4d3f748f9c69b3e99b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=storm+4+ppsspp+download PDF link annotation
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613143d7239df---ropuginuxufatitobegufaj.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613c936bd1ee9---38899890995.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c01fe3bd3---wazavazurex.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/82529037011.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/64389263144.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/xugadumakesatemopexarej.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/qn2iap62v9qkip07gr588rkba2/xiwisakisifedusasowewoduk.pdfIn PDF document text
    • https://sainaudit.mn/File/26238038082.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/40359634754.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/72778737191.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/getukufedep.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/ziwuroto.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a8d966633---47908230283.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/tuvikobubibaxebeneko.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/61001936091.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/56244688317.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/25700952073.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/52337271107.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141129e89084---81685841839.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/lotapefepesodafamiwugow.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/60322212937.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/wozufotelakos.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/aa86bcf4ab5eee91a1325b8ca9e75ce2/68043196760.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fe0c172ac---43115822225.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_off0000d7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 10568 bytes
SHA-256: d1ea2589d550cb93a1edbe65722baa4691e60e147c7b3c2d21e44403fc36a8f4
font_02_sfnt_off000107e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E9 18704 bytes
SHA-256: e6db61373634997ada4b032531bc176da29e363826bc1ccc04e24c0b38a8200f

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