Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ae69501c28fab8…

MALICIOUS

PDF

83.6 KB Created: 2021-09-22 18:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c2133dec9b87ce9676bc30d55e41b2f8 SHA-1: 6095efc8ba4b2499b244dc07508f02491813a93a SHA-256: f9ae69501c28fab847be93f8b02646ffab2710460be66badbdaf777be5c0ebd0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://archism.ru/uplcv?utm_term=how+to+make+a+reel+on+instagram+android PDF link annotation
    • https://rieker-consulting.eu/files/file/makopuzedipukinazekoz.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/retenujimakulale.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/tolofovolonevesomuvaferup.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/jasutazov.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bcd9760c3---25343288307.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/guwamavowu.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/16783015246.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16149069e7df77---gopoz.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/ginokav.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/selexe.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/1186383702.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ab438fa47---21841154935.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/3ab8hcebt31p9heuheblfp1pe4/wuwireke.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/64599608454.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/52811823745.pdfIn PDF document text
    • http://trovas.com/userimages/31466137566.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/79185348856.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/lugukalu.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/9ffcc792996a47d0548090a2a97eafc7/migigejuwupajadokidemu.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/bavot.pdfIn PDF document text
    • http://staropolski.net/Upload/file/voxozut.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/7254352062.pdfIn PDF document text
    • http://gnox.vn/upload/files/55060557065.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_off0000e2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CB 10760 bytes
SHA-256: 2bd08f1402c59f99d4f8916a3cd8b0530ee35a25bf8969bbae4730166864fb9e
font_01_sfnt_off0000fb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4B 17888 bytes
SHA-256: 2b396e01e4f552352d4feb64ff74cb1d71fe8ddd3cf50e3fe7001808a6ea6061
font_02_sfnt_off000128dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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