Malicious PDF — malware analysis report

Static analysis result for SHA-256 9227558cb9872cd3…

MALICIOUS

PDF

72.8 KB Created: 2021-09-22 22:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3f7b7b9d08b681b7847c02e77c5e1ae SHA-1: 4d51e8437ec3f90707bf2b445713674a87433537 SHA-256: 9227558cb9872cd3d02da64d247d487f4c743894440773029da5b45fb5de2ab6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on disposable or compromised domains. These links likely serve as lures for phishing or to download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://oniceh.ru/uplcv?utm_term=how+to+access+a+phone+with+a+dead+screen
    • http://xinchenfast.com/upload/file/tuvumipowawozarikuvas.pdf
    • http://saimiri.name/upload/file/91050544151.pdf
    • https://szaniterplaza.hu/ckfinder/userfiles/files/13004950325.pdf
    • http://mecaniquekd.ca/upload/file/gunolusidenewupe.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/63e3d657cc9c3b1dc733d3476c634acf/kiwufulowikonini.pdf
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/29845293550.pdf
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zewitatuziluzirenoxos.pdf
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/daxegepelorobadavewobabi.pdf
    • http://bertoniamministrazione.it/bertoni/public/file/48755033363.pdf
    • https://chptravel.ir/data/file/53260047409.pdf
    • https://blv.by/upload/editor/files/wefutedisogimak.pdf
    • http://theemasternetworker.com/ckfinder/userfiles/files/72518508116.pdf
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/38108952832.pdf
    • http://daisytalavera.com/userfiles/files/52094615314.pdf
    • http://hndgyl.com/v15/Upload/file/2021914448177586.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a2c17984f1b7e1d17e7a2e2924bd1751/guwuxamugoj.pdf
    • https://datajournonepal.org/files/58907054273.pdf
    • http://agataklimowska.pl/userfiles/file/buvatesezomobisoripumiwu.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161449502b4b5f---56177811602.pdf
    • https://basisnomor.com/contents/files/kagodu.pdf
    • http://hongsung114.com/files/fckeditor/file/zotogawisa.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613f22a3971e9---sesedivisopexukej.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/n4osnpf3qdh6nq4b3tjemol02n/wuniri.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_off0000bbfe.bin
81d08460562a835ed5a97101380af72fb735871c30229469e2721d8a5175aff8
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFE 10644 bytes
font_01_sfnt_off0000d454.bin
1a0ee0c99414562532114f251eb934bc56b5fc95560d48ce23c2d7743c752f9c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD454 15944 bytes
font_02_sfnt_off0000fd3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3B 16792 bytes