Malicious PDF — malware analysis report

Static analysis result for SHA-256 f00eca2fd0b6647f…

MALICIOUS

PDF

72.3 KB Created: 2021-09-05 02:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f93e83826d6fe47ffd61ccbec4b45018 SHA-1: 2564092a228bed366b3788587fa0ffee168ced4a SHA-256: f00eca2fd0b6647fc6dbb6a7e85d919fdac0650d101a2758d137e0de56f3afbb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm pointing to compromised WordPress sites or disposable hosting. This suggests the document is designed to lure users to external sites, likely for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=dilation+practice+worksheet+pdf PDF link annotation
    • http://secretinvitation.net/images/files/tewiporokarupozezufazeju.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/e793e714cc7da6c47bb7f3ac554d08d2/77690151607.pdfIn PDF document text
    • https://paradigma.bg/uf/file/77028975674.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/73468097660caa8e7efce8.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/6a4a2c164dd93d2ede1b36de039fcada/17589750712.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/89037125143.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/47738029430.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/jajusubizudevaxowarig.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160810d679c244---xewavutog.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/8b6ed301dd334104380143c6bd361834/wofolezite.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/e5c884b47d08697408ad361b565f7157/7842865142.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607eee5b8771f---30353246740.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/tunitukexokenufowiguzanud.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/85486139886.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/pamodomefinir.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/80312805494.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/99806477742.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5ff49a531663038684642df3cfea65cf/maninegekowipimeja.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d907f577af---77304631559.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/xagamome.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/44285185088.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/49536807500.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/pokazakajezubo.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f49398608---99584396704.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_off0000ba49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA49 15628 bytes
SHA-256: 09df5b52515371b489a805cb822cec81fced61fa9ac836942b73f8609f152702
font_01_sfnt_off0000e21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21B 10896 bytes
SHA-256: 29c6760c067d30f3ba4658b2d1acfd8d223ccf83f6ed017a0c215a566a2d535f
font_02_sfnt_off0000fb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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