Malicious PDF — malware analysis report

Static analysis result for SHA-256 00281150f1008a58…

MALICIOUS

PDF

82.7 KB Created: 2021-09-01 10:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1f2944e12841959864f9e795e833ee8d SHA-1: 2adbf2ef79f2da0c5c52e2983903cae6b3ff7ae1 SHA-256: 00281150f1008a580f5333847a8f1eec3dc11b45b91f36309157c95995a2a6ab
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggesting an attempt to download a second-stage payload. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=core+space+rules+pdf PDF link annotation
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1abdb89e62---69364245064.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751106b3d7a---sufuwuvamurobepolubabem.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/16868048123.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/79003323798.pdfIn PDF document text
    • http://candientushinko.com/images/file/zotizofapakejuxej.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/12609609042.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/zaxumi.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/sofudake.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/gukawokux.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/38265260272.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/turovevukalor.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/14149735640.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080615ff21f2---mugizanajesurujeduj.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160e47f75e2345---20004186181.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fb2712459---lelupukot.pdfIn PDF document text
    • http://jngf.cn/files/file/25271438697.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fdfd1527e3d---tomusazipukig.pdfIn PDF document text
    • https://congchung7.vn/upload/file/podaxusazeginonijelapo.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/vudibaw.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/zowugesegawe.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/d9dbc126869ab9e1c21ee9fe2354565d/43109515020.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_off0000e08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08E 16976 bytes
SHA-256: 9fc45c8ca174706e3a638933b47d850a0e241fde497b760240485c656f4c0b52
font_01_sfnt_off00010c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12439 10452 bytes
SHA-256: 32d43d4889289461f2ca087936dd6780150692956e37f4d452c46dd9a5329e27

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