Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2ee6eb9eef22b6f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-01 19:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 958f60423042f6522c966f6997ffe02c SHA-1: badf68a6616a66f9a422d18e9bf4e7bc742884a9 SHA-256: c2ee6eb9eef22b6fa2943a14a70ccc0f12ee6a3c2b196c4ced44f07c1ff50ebc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV both strongly indicate maliciousness, classifying it as a phishing trojan. The primary attack pattern involves directing users to potentially malicious external sites through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://braciszewska-klimek.pl/fck_files/file/xinodedoxosuzepomab.pdf In PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a79a6c4b91---26899720379.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e6b801d80---dupudilibelo.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/7380125948.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/35253323763.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b993e195c3f---57072097174.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/64070804856.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/djmrkic38i75jt5bn6n7fp4bpo/mofaripu.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/34524477609.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/k78evi8t5def2uqf3blqt433vh/mokuv.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd2838c832---dimemizulura.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/56255518203.pdfIn PDF document text
    • https://pixel.bg/img/file/povode.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/dumojeditipewapateraxori.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/c01c84ee355b6f8104bae45e769af170/vezikimewumagadaraw.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/95842246091.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/7fo51j3okkiv3c9ldtjhanamr7/bubidorupibosagof.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/60931731054.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/nebizuga.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/93122476722.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/bonuzefisesenez.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/pisifipemokete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=hurry+up+in+arabicPDF 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_off0000d185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD185 21972 bytes
SHA-256: f5975accc25bfb567ae23b2614be4bb5e6e83cbd65d63871e836f41ee5eeb04f
font_01_sfnt_off00010a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12231 10148 bytes
SHA-256: 6c42cabca4d1573eb4d6d0883e7f0bb3c5e6fce28065cd0e119118d0177b5e0b

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