Malicious PDF — malware analysis report

Static analysis result for SHA-256 b84d813865b56fbd…

MALICIOUS

PDF

82.2 KB Created: 2021-09-21 12:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 34c0c79895671808033b52c51efd63c9 SHA-1: 6eb24a39273e0a5cc8884f94fae779d6ffea63f3 SHA-256: b84d813865b56fbda541a49fe8bcbd52c1bab0f5d0dae2946f00c60e4ac5d1ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://medvor.ru/uplcv?utm_term=all+tenses+in+english+pdf PDF link annotation
    • http://cokhiminhhien.com/media/ftp/file/63238569245.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/6168114554.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/94502036499.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/vuzokovozitofufi.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/kurezo.pdfIn PDF document text
    • http://tzsunup.com/upload/majaxemig.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/1saipu2g93uqt8tq97brlk5d61/26690958443.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/4947602262.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/89104255189.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/55697865143.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/melipizokugipojupuko.pdfIn PDF document text
    • http://vititanon.com/user_img/files/84891087317.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/89266158577.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///nozogokikuderamoxiridon.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/zimufanoli.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161408182aa54a---74362452305.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/60620400216.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/fokuxodusebo.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6e3b9a904---72433258717.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/vubaxuz.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/monemixavo.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/c9dd3ec23d4035cd826635971ff86ea4/petelak.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161494516090f1---vojadutizosifofujipil.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/gutemobegip.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346b3724aa4---padavu.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_off0000deb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CE 10376 bytes
SHA-256: a70d9f5d177e122df0c5d4c440e38e6b3cd4b84026bdf31867331c5268be1b50
font_02_sfnt_off00010df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF1 17508 bytes
SHA-256: 1c63f8f44ccac333d2037f43af2108fb5f8b6f169f46b5aa1a3f406afb404851

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