Malicious PDF — malware analysis report

Static analysis result for SHA-256 e672d76ba482d8fa…

MALICIOUS

PDF

82.2 KB Created: 2021-09-24 05:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4cca4ede046fb91f24c7764bb3a20b18 SHA-1: 9b9b0b9e2ec53f7ef56fdf68e4b3d27aa0157fb6 SHA-256: e672d76ba482d8faeae4ad5e8a2d366bdc8dd64aa741e15e1e16630a677d6c56
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 documents. It also features a link farm pointing to multiple distinct hosts, some of which appear to be compromised CMS uploads, suggesting an attempt to obscure the final destination or leverage trusted domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://vcubusinesssolutions.com/userfiles/file/dijata.pdf In PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/balifawapo.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/54241361830.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138059347986---53882437182.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/towerosositogitegurizesad.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/53161116937.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/49575946563.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161410d8acf3d6---dotelabekusatogoves.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/8097716800.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/wizogam.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/6722618204.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/79803312261.pdfIn PDF document text
    • https://sapporopools.com/contents/files/notisabosimip.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/42070055877.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/4486784397.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134f039d0f45---pavozob.pdfIn PDF document text
    • http://decaiyun.com/upload/file/21090402520399595429s6dnnak22i.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/zemopa.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/banafejorizakomisoma.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441772686d7---zixunixokajijotanubega.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/dezotalerezagupezakafosi.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/gawokamolemebawogodipib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=billiard+mod+apkPDF 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_off0000d9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BE 19232 bytes
SHA-256: be05dbadf109c3cdf033c418ba54b0b7e4ac1aeafe6cfb22c5724d6f2a1ee2d3
font_01_sfnt_off00010ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA4 10196 bytes
SHA-256: ab1086cc5d545243002d2da58084aa89ac77381354457a1c6de108e2b6db7396
font_02_sfnt_off00012364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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