Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3e7c02da9f27b9…

MALICIOUS

PDF

81.3 KB Created: 2021-09-11 10:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 91b6eab41eb333c684ff52c046cccca8 SHA-1: cda261dabda2d6121d484ab047484e555e999e80 SHA-256: 4f3e7c02da9f27b9eab15f3cc83e678959c54e79ba9b6c4015d40b6400b23daa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or initiating redirects. It also features a link farm pointing to multiple distinct hosts, some of which are associated with compromised CMS upload storage, suggesting an attempt to obscure the final destination or leverage legitimate-looking infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://skupka54.ru/upload/m/wanalonogozozagemoduje.pdf In PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/xidubodarezigi.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/19818623802.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/dozofajusanudofiduju.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/figon.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/89106979767.pdfIn PDF document text
    • http://onlinevay.com/upload/files/88390322257.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/24667094548.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fffcf19734---tekipilaw.pdfIn PDF document text
    • http://usmleworkout.com/files/file/tasofakekemanexuzuditiza.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c94aef52d---88695800137.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/galakuwumugatom.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/dajaxed.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613606dd25e04---genikajenudi.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/6cf28e0a041f68d326f06b59c9d70018/1921698723.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/19175709296.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/54246461453.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/nenofiwixawakijelejataf.pdfIn PDF document text
    • http://zaiger.ru/img/file/vosamomafatinix.pdfIn PDF document text
    • https://aneri12.eu/res/file/45148579670.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/dudufezisise.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2adfe2e19---zoluraladadaxomok.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/falanijomosejizum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=angry+birds+ace+fighterPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613530d9eb1bf---43807103794.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB96D 20480 bytes
SHA-256: 3cd30016417488556fa44cc97149d3e9a21e7bdf2d8092401cdb037292c49c82
font_01_sfnt_off0000edf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10604 16840 bytes
SHA-256: 637f282a09958e0217b626fc4698b4d72005eb4dad7007e6f209d5e5c10a4ef2
font_03_sfnt_off00011e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4A 10824 bytes
SHA-256: f6004decd71f2e1444e5336fa8238d272b26b5c7b2d3747b6e6bc5febfca1be6

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