Malicious PDF — malware analysis report

Static analysis result for SHA-256 0428f6fb1260230a…

MALICIOUS

PDF

84.8 KB Created: 2021-09-02 07:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dfbd4f66a352138ea2de67ab90b8d9df SHA-1: be9d40dd189bcf9adab731d89c62d268af6acaf3 SHA-256: 0428f6fb1260230a016dc591d9eb01785bc8dbea402d52804bbebd6ed5861a70
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://philabc.ru/uplcv?utm_term=ketch+for+sale+by+owner PDF link annotation
    • https://didacostruzioni.it/userfiles/file/71620509811.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/56ec7d05c2e1df5e5aad05acdd58e933/38593053006.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abe03c26c7---rulopatusavikasaraxidut.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/vanogoko.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/zaberuxalejimonoxewazubi.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/vawidonutuxanubujudat.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad57d4ddff---88812464011.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/b661c398db13fa0a1ace7697ef55328c/fajemugunolixabeli.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/51994141597.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/tivubekit.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/kapikovogaf.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/93737796833.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/64957038369.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f51b3a4f09---68940515992.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/vozemuwodotedemugizuno.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/72785569138.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/4d9ee28166e512bc1ece46aa52693f13/59686220917.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/rozufitajujidugox.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/5405109967.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac11cb269d---64068358799.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/someka.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/198661391.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/razinejadaga.pdfIn PDF document text
    • http://charontrade.hu/data/file/51321466655.pdfIn PDF document text
    • http://rurisnet.org/images/file/gojin.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/42977570399.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_off0000e784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE784 17244 bytes
SHA-256: 33209d04df0f3b2db69520c32b177bba29e69baa553e8178581f5d098adff4a9
font_01_sfnt_off00011407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11407 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1E 10672 bytes
SHA-256: 234d80adef4bb473f2e23badcaffc37e993410f748839896acb4800e96ed3499

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