Malicious PDF — malware analysis report

Static analysis result for SHA-256 011d5f5ddf84dde9…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 22:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fa373a6d80bdf73a8193c02c37a549cc SHA-1: 1b0c09e810e7f37ac47f8e335e4a0145ca164538 SHA-256: 011d5f5ddf84dde968730d90105b7564a75cfb17e6d5e43c21521bf59bc2fec1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The file also includes numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=soundabout+apk+download PDF link annotation
    • https://marblobathware.ph/app/webroot/img/files/39391452653.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/2161938652.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/18249848023.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137d174a1f7e---53275478401.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/50889486183.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1631140566HYba.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/9g3rm1dd2bln4dj0dd2p4ihpqi/sovomajimobamejexul.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/remasoxozirosajivenitowi.pdfIn PDF document text
    • http://spharma.ua/files/file/50571834830.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/10771366569.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/vufixatovolawitibul.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/dewudiboderitalajatexurep.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/46089805106.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/lerukikor.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/podupujub.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/79249047367.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091900033533.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/lufamazonixomanavaloropex.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/goponeridu.pdfIn PDF document text
    • https://digireg.nu/upload/buvudo.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/golexitixumefejuden.pdfIn PDF document text
    • https://webhosting4.net/media/file/64934440506.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/51394699523.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b14421c62---74572451755.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/72284592071.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_off0000b164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB164 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97B 10388 bytes
SHA-256: 14d733c6bef86d7437a9c0e38d3f068e11368af7140fc3e9870b72cf91ca5a3b
font_02_sfnt_off0000e0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FC 16540 bytes
SHA-256: af6b22aa84e23c294caeea661a837b78721cc7730ff24907c67fc336ca0af5ce

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