Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8bf7277e76bf5ce…

MALICIOUS

PDF

85.0 KB Created: 2021-09-18 13:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fbe355c2d494e7f0902281d00f6e2684 SHA-1: f82151fe8348ea82d656ebbec2748fc3b863a27c SHA-256: f8bf7277e76bf5ce5d8dc971e13fdec81b02b8498075bdf576c81081df914e33
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, several of which appear to be compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://panova-art.com/files/file/wajufo.pdf In PDF document text
    • https://gdwtechnology.com/fckeditor/file/In PDF document text
    • http://csc021.com/userfiles/file/20210917140624_2gm670.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/minijuwowobutolagosovukul.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///54568552135.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/94602724130.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/tuririwotegunijuzuf.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161403205430d7---35361430332.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161301c241a7f9---dexepotuneliwubevu.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/12715744450.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136a21fe2125---gugajelij.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/gozebowewimowudazo.pdfIn PDF document text
    • http://maksimetall.ru/files/24212025005.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/donitoniwapu.pdfIn PDF document text
    • http://edeins.com/userfiles/file/nufizaxem.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/gelewasiwamulefemazise.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/dolobagijexusajukepixivi.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/53866850852.pdfIn PDF document text
    • http://retrofotr.cz/files/file/94950866667.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/52104376850.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/94808647704.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfdd87a575---misavokuxujufujovilorisud.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/67378620952.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/8135801235.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/62641455812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=watch+gewoon+vrienden+english+subtitles+online+freePDF 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_off0000e3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F1 18504 bytes
SHA-256: 29bca4dbe99cc4ff0bc3fb7362985c43dc7c73107fe87a41206b049272c1b5d1
font_01_sfnt_off00011415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11415 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2C 11140 bytes
SHA-256: 472dc76685c72059ab4946d9a1a38ada3f310df69c7c3eae8dc9b0b7480a6f00