Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d2283f8f4e8d24a…

MALICIOUS

PDF

78.3 KB Created: 2021-09-06 22:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 46a3f7fa7bfd49c7e1e6e440c21d793a SHA-1: 888604669d196930b53f4222a89d96628a7b8e01 SHA-256: 1d2283f8f4e8d24a03c54b3773865fb01bca70eee82dcc8b9da3601cdd358290
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The sample also features a link farm pointing to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious sites or download further payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gruppocaminiti.it/userfiles/files/75412588751.pdf In PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/76470503648.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/14585336822.pdfIn PDF document text
    • http://ibb-online.ru/f/file/peboworedifovigelolajow.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e1e8dfb7b63---libezasoji.pdfIn PDF document text
    • https://razredna-nastava.net/files/fetomimoxudosexavaka.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f63b910e9---38318266370.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/6c932d2d18006dc646985d593ede39b3/23075020361.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/0788d180f8e8b4f2c5a46eb81bf32288/lizowo.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kolivuluxonagotukokumi.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/wakilotiridejapod.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/nudubisalode.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/gidomofa.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706668874fb---pukuratedife.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/a64e0cfad96d8fa2bf83faa48562b782/likufikekumiro.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/zetafakumiw.pdfIn PDF document text
    • http://k1a.ru/images/files/file/mojuverokewofuruvanepe.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/jomurakimonubow.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/bosekisizubowuwapafubama.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9d5d2e44c---67217065332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=excel+file+converter+to+pdf+free+softwarePDF 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_off0000ce28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE28 10848 bytes
SHA-256: d13640733855cb70a6fd6f2d43b23ca17edce9d3d2708ef3560fd2d95e6e06a9
font_01_sfnt_off0000e766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE766 17260 bytes
SHA-256: 3d056a567d2e454d3ad91d7415a2ec5dd13c0116baf3cf74f8d7f3d02f07d7b7
font_02_sfnt_off0001140c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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