Malicious PDF — malware analysis report

Static analysis result for SHA-256 4519092eb0414df2…

MALICIOUS

PDF

78.2 KB Created: 2021-09-07 09:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 300fc1c26d21fd1e9cf6cdc9f74e9f11 SHA-1: 9076a0e3b6ee0b7677fc76d190b60e1367e5df48 SHA-256: 4519092eb0414df20dbf8a79afe82e7f7c47ee27ccf506867a24d06a37d8feef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cructi.ru/uplcv?utm_term=using+sqlite+o%27reilly+pdf PDF link annotation
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094bf0bebd21---lomemakukedadara.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/74308517621.pdfIn PDF document text
    • https://maturana.cl/upload/file/notewavifulumajozajafuje.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823b8471a12---kominilisanurire.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/78613829666.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/vh3ubmpvf78on25oh973a1c3n8/rusotipemisujubojezasa.pdfIn PDF document text
    • http://npas.ru/pic/file/81553178053.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/dasevofovufowale.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/97944442169.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/61670935187.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/zulowesopewikirakune.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/gixit.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/1c1377ed5a8802a8787d8c7eb020105e/solasulimemojevereg.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a7ac3792d---pakanoz.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/68304531731.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/losisupixu.pdfIn PDF document text
    • http://myredm.ru/uploads/file/pedisexozirusekususexel.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/061937222993.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/xifuf.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/dogusowurixebozevidenelej.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/kuvixivi.pdfIn PDF document text
    • http://coinmarketsuite.com/ckfinder/userfiles/files/31260362693.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/gexakuposidag.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608218f8da503---tajagutewirasetiwagod.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC3 10812 bytes
SHA-256: c1566fab25dc32c5c0d0753e100555adc91b818af8a16dafdcbb02f0e87e5fce
font_01_sfnt_off0000e44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44E 17376 bytes
SHA-256: 7228ff771675d8150dd35b8b16da9011028938dfc74a2236344b75d893ba018b
font_02_sfnt_off0001115d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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