Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e99b6d2c9a0a1ff…

MALICIOUS

PDF

69.7 KB Created: 2021-09-28 10:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 087286e121142e2f961e25e6d96c0883 SHA-1: b4cf07d5bef5c27f15543dfd4fc4f7cf9a7be688 SHA-256: 0e99b6d2c9a0a1ff804b84e2ee8686cb789237a950ec1b1669e2d1652b551b61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous URLs, many pointing to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=angel+number+737+twin+flame
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/sdvkfsofav0knb4bhc0cmmd73q/giremaf.pdf
    • http://studioarclab.eu/userfiles/files/poxosobaneg.pdf
    • https://marjoyunlar.com/calisma2/files/uploads/kovidekifozivizoduwufat.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374950ced06---52495427122.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613897970ea72---joxogiranudirozisix.pdf
    • http://vizesblokk.hu/files/file/15100626057.pdf
    • https://lotteppta.com/beta/assets/file/bojovetuz.pdf
    • http://fazendasaojudastadeu.net/fotosempresa/files/leguzadatirixozopodarija.pdf
    • https://affordans.com/ckfinder/userfiles/files/68398045088.pdf
    • http://datcat.vn/2018/file/nogakopi.pdf
    • http://dhf-china.com/d/files/vowolara.pdf
    • http://style4.allwebeasy.com/userfiles/files/jofokugujamibavi.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/679be4ef98ebb97c9cf0277247ee055c/jimegigofe.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614336e91c0e0---17114763388.pdf
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/92189085189.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161378b79c6af4---kunepefep.pdf
    • http://patronusalapitvany.hu/public_html/upload/94377895429.pdf
    • http://ukrainski-rosyjski.pl/userfiles/file/zenugebapiwowexusodo.pdf
    • http://studiotipaldo.com/userfiles/files/kobuxudilor.pdf
    • http://tcsklife.com/filespath/files/20210906035506.pdf
    • http://betonkeritesek.eu/Content/files/xowulupoji.pdf
    • http://sbstroy53.ru/img/files/71260739236.pdf
    • https://cambodiaangkorhomestay.com/userfiles/file/72542727725.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_off0000aefe.bin
2b48bda77284037e4da9c483918ecf094d06fe6fd3b1f330c35ab1f7e85ce469
pdf-font-stream PDF embedded font (sfnt) at offset 0xAEFE 16920 bytes
font_01_sfnt_off0000d845.bin
67aea3b8053168694c0c5639a040e7733157fddcaafd00e12bc26535b941a980
pdf-font-stream PDF embedded font (sfnt) at offset 0xD845 10800 bytes
font_02_sfnt_off0000f14c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF14C 16792 bytes