Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace92ccc03fc4f2d…

MALICIOUS

PDF

88.0 KB Created: 2021-07-07 21:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4789cfc5c3ea824c7bf802cf039a8c92 SHA-1: e705e4dbee9af4b7d2b508c83641fee6bc65f90a SHA-256: ace92ccc03fc4f2db19f67dc90def54e54fb2d7d42d08b4a6505f61934bb9981
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a payment redirection lure and ClamAV detection, indicating a phishing attempt. The document contains a link farm pointing to compromised WordPress upload storage, suggesting it is part of a larger phishing infrastructure. No scripts were extracted, but the presence of external URIs and the nature of the heuristics strongly suggest a malicious intent to deceive the user regarding financial transactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070e07578b6f---pebekozosuxapokebumubuw.pdf
    • https://itchanoi.vn/uploads/news_file/54866115446.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/4acd183965f79ef3f8c5ede14067a533/82752939281.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e79410d5af---nevizamisukajag.pdf
    • http://pm-property.pl/userfiles/file/wunokevuviwuzusunosidofi.pdf
    • http://karimeh.com/public/userfiles/file/rekapujidomapugarututopam.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/260b055d509773c40be19a92c84ee2c3/wirud.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b2062fc86d5---digujarugamedaposepilip.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f89e96a19---84675687025.pdf
    • http://oio.cn/uploadfiles/files/78476090565.pdf
    • http://sl-light.ru/design/img/upload/file/wuwiruwinefibejog.pdf
    • https://thietbivesinhsonhoa.com/webroot/img/files/32121454147.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/hns535a8nijem1isolhg6cdtla/kesixavinafafemaxisab.pdf
    • http://vksraja.in/fckeditor/upload/file/xeperinogedu.pdf
    • http://afghansolar.com/userfiles/file/gajukolamuzokezira.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/0f9iqh8vptp6lur6g2tvvm9vau/24448654172.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/1ef09e1c83ce4be41ec5cd67f4a992c4/25316943446.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/8c162335e50dddbe73bc865a2b6da165/fufataxo.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b86e5847213---repaninomidebamozebix.pdf
    • http://autobedrijvenindex.nl/images/uploads/75390795309.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a472ed81243---67350925028.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/84304321649.pdf
    • http://whuntex.ru/userfiles/file/sudeval.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=right+foot+now+left+foot+drake
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55f449c060---zawisefe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef49.bin
404ab7b53627c7aab20525c0a98749cccd2fa62a0044f3486d2068d3bf8bbfc0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 19020 bytes
font_01_sfnt_off00012155.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12155 16792 bytes
font_02_sfnt_off0001396c.bin
c35f7406345e5e0edc20525e18213dd613be11696f499b98d853fdbea4a9d620
pdf-font-stream PDF embedded font (sfnt) at offset 0x1396C 10688 bytes