Malicious PDF — malware analysis report

Static analysis result for SHA-256 25016422c5944051…

MALICIOUS

PDF

81.4 KB Created: 2021-09-15 12:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4e1e03b731b8f6381439acc8247d4ab9 SHA-1: 0852f1a14d392e322797e8a37e38654ea84dc88d SHA-256: 25016422c59440516c41d02f20d66df35ee419a33dd25ecd9e5d0088e5a548d2
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://laborke.ru/uplcv?utm_term=virtual+dj+download+apk PDF link annotation
    • https://mk-promotions.com/ckfinder/userfiles/files/31586345760.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/69612314399.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/85602517850.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/jutunan.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/72899378345.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613238394bdbb---niriwosimikapafe.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed3f354019---naviboresof.pdfIn PDF document text
    • http://househouse.it/userfiles/files/bobutipobanaduwekafunes.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411b759ca49---depabagewejar.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/23438139764.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/j2pti30l9itg74jv9mem7lgpls/29831032935.pdfIn PDF document text
    • https://podimercrm.com/img/files/vubaso.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/61331681838.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130cede0abe2---nasivulolevuzawi.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/jasezuvinupuramoxefi.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/tipasibexeluteferifujelaz.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141576cb2120---77767018511.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/serib.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/faterukarorasod.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/7v4piiacmbbronhdjmqsopcbnb/tovunamaxebizanemujuwojow.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/wulanebomogebegolakewumad.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/waleta.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_off0000d542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD542 19480 bytes
SHA-256: c2dabfc3c76d38d19a4bdc90cd392334f739bcd7da85633b78abba1154557f92
font_01_sfnt_off0001081e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081E 10464 bytes
SHA-256: b4059570fb367e99fa3f33455c45e1ec3f9f879f6a5b76a65bbfd458763dd9b9
font_02_sfnt_off00011fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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