Malicious PDF — malware analysis report

Static analysis result for SHA-256 63df6323d3a8b530…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 04:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 032cbe8f7676c22ff82c4dbde8064b51 SHA-1: 753b6a924b02a7026b57f6404d95bc2dc15b083a SHA-256: 63df6323d3a8b5304b877bf39c2739e2f6bc0fa53b23f2e5c697def1e7b5205a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://medvor.ru/uplcv?utm_term=left+handed+characteristics PDF link annotation
    • http://chothuexeninhbinh.net/data/dulieu/files/buxixib.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/reviremuvovezagawom.pdfIn PDF document text
    • https://pecsikult.hu/files/file/simalebak.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/93110722499.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/56740182315.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/46834cb0c998dff85d4d11c34246db2b/mimiriderekalovepo.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/4a324707fd8ec2d76d611f69ace141ce/6670396715.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080906b966fe---94618784473.pdfIn PDF document text
    • https://dalba.net/other_files/File/fazebibasazakegibebovazig.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/zesipibinavub.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/42330731009.pdfIn PDF document text
    • http://househouse.it/userfiles/files/giwavij.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/pokabufer.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/megubuwe.pdfIn PDF document text
    • http://195exim.com/datas/files/86669128835.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/novuvigopup.pdfIn PDF document text
    • https://sanidom.pl/img/file/zalawofef.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/d6f806741f1ea3bbf22d9aae0e44def5/lavibajujuxiz.pdfIn PDF document text
    • http://krugernilssonreunion.org/clients/c/c3/c301050bdfa85653d7453904791897ac/File/31452614488.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/485dbe161f2aaa41eabf17847d0e886b/dikukusudexokalavub.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d465da01ee36c13c2eb2daf8caf289c0/56268167514.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/wukiz.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/4cq37vo11iouobhqomg1ms4m83/10901378292.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/29dd4420097291c5befb3533ef0622d4/62223864052.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607862b7dd1c7---sewukoxusagi.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_off0000e532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE532 10364 bytes
SHA-256: ec55cc165ea6abcdc5587edd349fd6fa45a2d5ffc5dc55d0f5005bc1db181e63
font_01_sfnt_off0000fc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC81 17400 bytes
SHA-256: fc9de24b3997cce8971343eae991f28554ccdc9821fb662ccb4ca10cf7082a4e
font_02_sfnt_off0001298d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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