Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b187b5ec67eee0…

MALICIOUS

PDF

78.9 KB Created: 2021-09-05 13:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 697cde9c434b02960b6e883175185cc4 SHA-1: 4363fb52826689baee08b0e96da63fba05cbdc20 SHA-256: 28b187b5ec67eee048e99089ff4ebefaa8301dcf92664a771c7fa0c9eddfb02d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS uploads or disposable domains, suggesting a phishing or credential harvesting campaign. The presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=tabular+model+ssas+pdf PDF link annotation
    • http://thedreaminitiative.org/Content/Admin/uploads/files/74756689644.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/vafawudibajisiti.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608463dbde7c6---momasisikofusorinosobu.pdfIn PDF document text
    • http://cochemical.com/upload/files/84142092308.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160716fc6545bf---zovevi.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/vebosatozusima.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f5a8fc0dc8a---65953655449.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/42670601870.pdfIn PDF document text
    • https://e-midas.ro/files/file/zowuxetobatekedivepafudef.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/f1dc37155b1331c41a4f4f795e09a56f/jisezafutiku.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/kiparavutisibomadeban.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084261916bd7---3123513112.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/fujebuxivetinup.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/veguku.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4b712fb88---18533863272.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/munufuzunokunifamigimar.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/gozazema.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610603e5ec6e8---dowadetekesixo.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/86008791852.pdfIn PDF document text
    • http://langmypham.com/luutru/files/mufawabamugulanugek.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/38435731380.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210828045903.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/63257214283.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/pukaduxex.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/ridaxetapupuvujadupod.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_off0000d07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07E 10568 bytes
SHA-256: 9e5ba1a927588c927a479c583e50f926d39cae380ae4cbc5a9f2aa487d01f2df
font_01_sfnt_off0000e869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE869 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001007b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007B 17464 bytes
SHA-256: e97cd4824f5f9bfffcb31427c97260b30dac29c7c921d124f3b70f5eb3935222

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