Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb044cfa311873aa…

MALICIOUS

PDF

87.2 KB Created: 2021-09-10 01:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b16392a086534509a4fe6ec49da7b66c SHA-1: 1d947015e5c5e307d9b14c4346b76a82b0419a79 SHA-256: cb044cfa311873aa25b4c7fb620ccea82ed21328ae6d7397a95a1c48644b0b09
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or download of a malicious payload, while the link farm serves to obscure the ultimate destination.

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 http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/29892423830.pdf In PDF document text
    • http://coumert.com/images/file/loparedajenewaxer.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/67077791909.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/bevumanepadano.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/sazudisemuzupevetefa.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378a0580204---95901833797.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/77272547288.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/59531821797.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/37753957218.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe97604757---94051996869.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/jogotirujavoka.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/buvenime.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/nuzedigisuxodonuwokul.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/7780514305.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/kumow.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/10087643655.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/likurupekifiwabu.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c0641eab8---juzokuvesaful.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/20548647209.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/nofuvevafidilakivatet.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/93575759685.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/304ebd5122228d70eb89c12bf7f5ab07/98553627545.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/87680263767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=john+gba+lite+gamesPDF link annotation
    • 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_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 18080 bytes
SHA-256: b0ef358b77eb5abe3a4757b0f0ed96d20fe833a494fc84d6821a933c78ba0015
font_01_sfnt_off00011f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F65 10584 bytes
SHA-256: 2a8c4ef1dd4a4e72b9c102581ad3cd0d69dc28f565b227d444776ca4023694e9
font_02_sfnt_off0001376d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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