Malicious PDF — malware analysis report

Static analysis result for SHA-256 223b8b922bc32bed…

MALICIOUS

PDF

85.4 KB Created: 2021-06-28 14:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f25036a4fa12dde33ce93d82cda2de08 SHA-1: 428b1487ea523fb080f016711da537f55962ef36 SHA-256: 223b8b922bc32bed20dbb6c4bca3b93694c8803d8b9010bf581aa6e89a5190ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. This suggests the document is designed to lure users into clicking links that likely lead to phishing pages or malware downloads. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://synerhu.ru/uplcv?utm_term=what+does+cde+stand+for
    • http://kmkonsult.cz/userfiles/file/jinafedofukunat.pdf
    • https://moraure.net/js/ckfinder/userfiles/files/1643341157.pdf
    • http://activesolutionelectric.com/images/file/mepebitabanitiw.pdf
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/e33f34624b066e1d7e916b1ea9b3f7c5/87158844410.pdf
    • https://mimpishio2bet.com/contents//files/jakexotagazov.pdf
    • https://ivanda-commerce.hr/userfiles/file/wopofav.pdf
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/8b5729938c10f6c3dadd6b40ae813465/jaxitonifazanuletu.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8161914282---bazowatebokij.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c0ca86b30---jusuzalajimidutigofate.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/18ad28a5a113439b00091061eb07dcd0/movofir.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-5-4/20210504115257183607.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/fb23a4ed8e886525cea05d7e4cfc7307/27543489577.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/h8f18lok57hsqiabpa0h3ioer1/dekegofexukogewowosikoxu.pdf
    • https://mariellatriolo.it/public/file/mesagofidibopibitufed.pdf
    • https://sieuviet.net/webroot/img/files/tesexijopiviruraxep.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ba578a7f4---20885930558.pdf
    • http://aardbeienfeesten.nl/uploadimages/files/jinamodebovuvisivobidopaj.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a48f9c0c2c---gomumov.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/e4d98323463d9c2dacbf8ab61049e763/63111358325.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9d5dce50c---9015736375.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-5-3/20210503191115410720.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea78.bin
efcd1b25e2d46861a903c56e01eb3c99e6325fa78f327bf8687f22d3130ea9eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA78 10428 bytes
font_01_sfnt_off00010218.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10218 16792 bytes
font_02_sfnt_off00011a2a.bin
a707fe71f13c732640b19a7fdb7bd8d5761e3c4c9ae2b1052f00a06002a940fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2A 18460 bytes